Fix ContextualLogger bypassing Serilog destructuring policies (v11)

[mishioo]

same as #872

Summary

ContextualLogger<T> only implemented Write(LogEvent). On Serilog 4.x, Information, Warning, and similar APIs are default interface methods on Serilog.ILogger that bind templates via an internal unconfigured logger, so registered IDestructuringPolicy instances (including BaseSanitizer<T>) were never applied. Message binding must use the same configured Serilog.ILogger instance that owns the pipeline (including sanitizers).

This change implements BindMessageTemplate on ContextualLogger<T> and forwards to the inner logger. NullLogger<T> implements BindMessageTemplate by returning false so binding does not use the default static implementation.

Test plan

• Added ContextualLoggerDestructuringTests: configures a logger with Destructure.With<RightSanitizer>(), logs {@Payload} through LeanCode.Logging.ILogger<T> (ContextualLogger), and asserts the captured property reflects sanitization (placeholder present, raw secret string absent).

Notes

• NullLogger: returning false from BindMessageTemplate avoids constructing log events from the default binding path; behavior remains a no-op for logging.

---

Made with Cursor.

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
947	946	0	1	0	0	1m 54s

Skipped

Tests	Status
LeanCode.Azure.Tests.AzureStorageAuditLogIntegrationTests.Ensure_that_all_logs_are_correctly_uploaded_to_multiple_files	skipped ⏭️

_{🎉 No failed tests in this run.}

Github Test Reporter by CTRF 💚

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.41%. Comparing base (dc31091) to head (d050205).
⚠️ Report is 3 commits behind head on v11.0-preview.

Additional details and impacted files

@@                Coverage Diff                @@
##           v11.0-preview     #873      +/-   ##
=================================================
- Coverage          85.57%   85.41%   -0.17%     
=================================================
  Files                246      246              
  Lines               5206     5210       +4     
  Branches             388      379       -9     
=================================================
- Hits                4455     4450       -5     
- Misses               668      676       +8     
- Partials              83       84       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.