fix(flagd): log expected sync-stream recycles at debug, not warning

[toddbaert]

All our streams use a 10 minute deadline by default - for that reason, many stream "errors" represent expected behavior. The stale -> error transition is really what's a error - so this line should be DEBUG or we get massive logspam (this was unintentionally changed here).

[coderabbitai]

📝 Walkthrough

Walkthrough

The gRPC watcher now logs fatal RPC errors at error level and non-fatal errors at debug level with an explicit reconnection message.

Changes

gRPC Error Logging

Layer / File(s)	Summary
Classify and log RPC errors providers/openfeature-provider-flagd/.../grpc_watcher.py	_handle_rpc_error checks fatal status codes before logging, uses error logging for fatal errors, and uses debug logging for non-fatal errors while retaining reconnection behavior.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: aepfli

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: lowering expected sync-stream recycle logging from warning to debug.
Description check	✅ Passed	The description is directly related to the logging change and explains why the warning should become debug.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.55%. Comparing base (cde03cc) to head (eb40342).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #405   +/-   ##
=======================================
  Coverage   95.54%   95.55%           
=======================================
  Files          24       24           
  Lines        1033     1034    +1     
=======================================
+ Hits          987      988    +1     
  Misses         46       46           

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