raft: reduce async storage missing entry log noise

[NasitSony]

Summary

Downgrade the log message

entry at index %d missing from unstable log; ignoring

from info level to debug level.

Motivation

With async storage writes enabled, this condition can occur during normal processing and generates noisy info-level logs. Since the condition is expected and non-actionable in this mode, debug level is more appropriate.

Testing

• Updated async storage trace expectations.
• Ran go test ./....
• All tests passed.

Fixes #307.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @NasitSony. Thanks for your PR.

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