Improve SSI

[lloeki]

What does this PR do?

General improvements to the current SSI injector bootstrap implementation

Motivation:

Some things are not quite covered.

Change log entry

Rework SSI from the ground up.

Additional Notes:

How to test the change?

It's a bit hard right now, either we have small granularity CI but a lot of environmental invasion (rspec) or we have isolation but coarse granularity (vaccine). Working on it.

[github-actions]

👋 Hey @lloeki, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

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^{Visited at: 2025-07-16 12:11:55 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: lloeki/ssi
Commit report: 481cf7f
Test service: dd-trace-rb

✅ 0 Failed, 21765 Passed, 1296 Skipped, 4m 38.86s Total Time

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.54%. Comparing base (e3a154b) to head (26ed8db).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4366      +/-   ##
==========================================
- Coverage   97.55%   97.54%   -0.01%     
==========================================
  Files        1484     1484              
  Lines       88730    88729       -1     
  Branches     4606     4606              
==========================================
- Hits        86558    86553       -5     
- Misses       2172     2176       +4     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-07-11 14:22:57

Comparing candidate commit 26ed8db in PR branch lloeki/ssi with baseline commit e3a154b in branch master.

Found 1 performance improvements and 3 performance regressions! Performance is the same for 43 metrics, 2 unstable metrics.

scenario:error - error tracking with http - all

• 🟥 throughput [-121.749op/s; -114.925op/s] or [-96.667%; -91.248%]

scenario:error - error tracking with http - third_party only

• 🟥 throughput [-126.272op/s; -122.481op/s] or [-95.700%; -92.826%]

scenario:error - error tracking with http - user code only

• 🟥 throughput [-126.852op/s; -122.555op/s] or [-95.870%; -92.622%]

scenario:profiling - intern_all 1000 repeated strings

• 🟩 throughput [+1165.159op/s; +1238.783op/s] or [+5.081%; +5.402%]