classify mongo connector KeyNotFound error

[jgao54]

Fixes: DBI-1108

Observed error message:

failed to create change stream: connection() error occurred during connection handshake: auth error: unable to authenticate using mechanism "SCRAM-SHA-256": (KeyNotFound) No keys found for HMAC that is valid for time: { ts: Timestamp(xxxxxxxxxx, xxx) } with id: xxxxxxxxxx

Happens right after "(ShutdownInProgress) The server is in quiesce mode and will shut down" error. Transient and automatically recovers

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[github-actions]

🔄 Flaky Test Detected

Analysis: A single unrelated Postgres unit test (TestRunPipeline_FilterStripsLines) failed with "src failed: signal: killed" — its local printf subprocess was SIGKILLed externally (resource pressure on the loaded CI runner) — while the same test passed on the other two matrix legs and the PR only changes Mongo error classification.
Confidence: 0.9

✅ Automatically retrying the workflow

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