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Celia Chen 2347a61d0d Add bounded credential-storage telemetry helpers (#47901)
## What changed

- Add `StorageTelemetry` to record operation counts, durations, secure-store outcomes, and file fallback reasons using bounded labels. Emit fallback warnings without credential payloads or error text.
- Add task-local client attribution with explicit propagation across task boundaries.
- Preserve typed keyring error causes through `std::io::Error` and the local secrets backend, classifying supported native failures without parsing error messages.
- Remove service names, account names, value lengths, and error text from keyring trace logs.

## Testing

Add tests for buffered metric emission, fallback outcomes, exclusion of sensitive error contents, client attribution isolation, and typed native error classification.

GitOrigin-RevId: 18e7201566a3b09061a6014fd6bd90eae96e3fc2
2026-09-24 18:08:31 +00:00
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