chore: Various quality of life changes around CN <-> BN communication

[timfn-hg]

Description:
This PR introduces several changes to improve various parts of the CN/BN communication layer. Most of the changes are related to logging and otherwise not very impactful. The full changes include:

• Standardize logging formats.
• Reduce connection state transition logging from INFO to DEBUG to reduce log volume.
• Introduce a request counter that is scoped to a single streaming connection for better correlation of each request. Previously, only requests associated with a block would have a unique request number that is shared with the block node. This new "connection request number" is captured only in the consensus node and is not part of the correlation ID passed to the block node. In the logs, this new ID is appended to the existing correlation ID so it doesn't impact searching for common correlation IDs between the consensus node and block node.
• The request latency metric is converted to microseconds instead of milliseconds. In many cases, sending a request to the block node may take less than a millisecond, so by capturing the latency in a more granular resolution it will make observability a little more useful.
• Exhaustive error handling when sending a request to the block node. Previously, there was a scenario in which a request being sent could time out and if the connection transitioned to a terminal state, there would be no indication of the timeout. Furthermore, because there was no escape when this happened, later in the code when the request duration was calculated it would resolve to a very large negative number. This is the result of capturing the starting time, but not capturing the ending time and so the duration would be captured as something like 0 - 193083817, which is interpreted as a duration of negative hundreds of days.
• Introduce a cool down when a block node is well outside the range of the consensus node. Previously, when we checked the server status API to determine what the wanted block was, if a block node was very far behind we would not put the node in a cool down period. This meant that if a higher priority block node was always behind, we would try to re-fetch the status every time the connection monitor was invoked. Now, we will place the node in a cool down if we determine the node is far behind. The duration of the cool down is based on how far behind the block node is: if the block node exceeds the "low" threshold, then it is placed in a basic cool down; if it exceeds the "high" threshold, then it is placed in the longer, extended cool down.
• Introduces the streaming connection heartbeat updates in more places. If we are under high load and frequently have enough items to keep sending, the heartbeat may not get updated frequently enough and thus can trigger the stalled connection detector prematurely.

Related issue(s):

Fixes #

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

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[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

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✅	Open Source Security	0	0	0	0	0 issues

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[codacy-production]

Not up to standards ⛔

🔴 Issues 19 minor

Alerts:
⚠ 19 issues (≤ 0 issues of at least minor severity)

Results:
19 new issues

Category	Results
CodeStyle	19 minor

View in Codacy

🟢 Metrics 9 complexity

Metric	Results
Complexity	9

View in Codacy

🟢 Coverage 79.59% diff coverage · -0.01% coverage variation

Metric	Results
Coverage variation	✅ -0.01% coverage variation (-1.00%)
Diff coverage	✅ 79.59% diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (198285b)	100192	78875	78.72%
Head commit (ba43a83)	100256 (+64)	78914 (+39)	78.71% (-0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#25203)	147	117	79.59%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

❌ Patch coverage is 75.51020% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...s/impl/streaming/BlockNodeStreamingConnection.java	74.78%	24 Missing and 6 partials ⚠️
...cks/impl/streaming/BlockNodeConnectionManager.java	62.50%	3 Missing ⚠️
...ks/impl/streaming/AbstractBlockNodeConnection.java	75.00%	1 Missing ⚠️
...cks/impl/streaming/BlockNodeServiceConnection.java	0.00%	1 Missing ⚠️
...om/hedera/node/app/metrics/BlockStreamMetrics.java	50.00%	1 Missing ⚠️

@@             Coverage Diff              @@
##               main   #25203      +/-   ##
============================================
- Coverage     74.90%   74.88%   -0.02%     
  Complexity    11524    11524              
============================================
  Files          2586     2586              
  Lines        100289   100353      +64     
  Branches      11087    11098      +11     
============================================
+ Hits          75119    75149      +30     
- Misses        21364    21389      +25     
- Partials       3806     3815       +9     

Files with missing lines	Coverage Δ	Complexity Δ
.../node/app/blocks/impl/streaming/BlockBufferIO.java	87.70% <100.00%> (ø)	0.00 <0.00> (ø)
.../app/blocks/impl/streaming/BlockBufferService.java	73.74% <100.00%> (-0.89%)	0.00 <0.00> (ø)
...dera/node/app/blocks/impl/streaming/BlockNode.java	96.09% <100.00%> (+0.20%)	0.00 <0.00> (ø)
.../blocks/impl/streaming/BlockNodeConfigService.java	95.68% <100.00%> (ø)	0.00 <0.00> (ø)
...ra/node/config/data/BlockNodeConnectionConfig.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...ks/impl/streaming/AbstractBlockNodeConnection.java	91.17% <75.00%> (-0.83%)	0.00 <0.00> (ø)
...cks/impl/streaming/BlockNodeServiceConnection.java	90.47% <0.00%> (ø)	0.00 <0.00> (ø)
...om/hedera/node/app/metrics/BlockStreamMetrics.java	72.59% <50.00%> (ø)	0.00 <0.00> (ø)
...cks/impl/streaming/BlockNodeConnectionManager.java	93.22% <62.50%> (-0.40%)	0.00 <0.00> (ø)
...s/impl/streaming/BlockNodeStreamingConnection.java	83.51% <74.78%> (-3.01%)	0.00 <0.00> (ø)

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4 file(s) changed in commit 69330e6

[github-actions]

Flaky Test(s) Detected

One or more flaky tests were detected in this run. These tests have been reported before.

Test	Ticket
com.hedera.services.bdd.suites.freeze.JumpstartFileSuite#jumpstartsCorrectLiveWrappedRecordBlockHashes	#24927
com.hedera.services.bdd.suites.validation.LogValidationTest#logsContainNoUnexpectedProblems	#25154

[github-actions]

Flaky Test(s) Detected

One or more flaky tests were detected in this run. These tests have been reported before.

Test	Ticket
com.hedera.services.bdd.suites.freeze.JumpstartFileSuite#jumpstartsCorrectLiveWrappedRecordBlockHashes	#24927
com.hedera.services.bdd.suites.validation.LogValidationTest#logsContainNoUnexpectedProblems	#25154

[timfn-hg]

Passing XTS (BN Comms tests): https://github.com/hiero-ledger/hiero-consensus-node/actions/runs/25230279973