[Exporter.Geneva] Fix AFDCorrelationId retrieval exception handling in Geneva Exporter

[rajkumar-rangaraj]

Fixes #
Design discussion issue #

The AFDCorrelationIdLogProcessor was throwing unhandled exceptions when attempting to retrieve the AFDCorrelationId from RuntimeContext if the value had not been previously set by customers. This caused processing failures in the telemetry pipeline.
Solution.

Changes

Please provide a brief description of the changes here.

• Added a state tracking mechanism using GenevaAfdCorrelationIdStateTracker to remember when access failures occur
• Created a RuntimeContextSlot to track correlation ID access state
• Added try-catch block in GetRuntimeContextValue() to handle exceptions gracefully
• Implemented a check to skip attempting to access the correlation ID if previous attempts failed
• Added proper resource cleanup in the Dispose method

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 56.52174% with 10 lines in your changes missing coverage. Please review.

Project coverage is 52.84%. Comparing base (71655ce) to head (3266416).
Report is 809 commits behind head on main.

Files with missing lines	Patch %	Lines
...er.Geneva/Internal/AFDCorrelationIdLogProcessor.cs	72.22%	5 Missing ⚠️
...ry.Exporter.Geneva/Internal/ExporterEventSource.cs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2708       +/-   ##
===========================================
- Coverage   73.91%   52.84%   -21.08%     
===========================================
  Files         267       55      -212     
  Lines        9615     5079     -4536     
===========================================
- Hits         7107     2684     -4423     
+ Misses       2508     2395      -113     

Flag	Coverage Δ
unittests-Exporter.Geneva	52.84% <56.52%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...er.Geneva/Internal/AFDCorrelationIdLogProcessor.cs	81.25% <72.22%> (ø)
...ry.Exporter.Geneva/Internal/ExporterEventSource.cs	16.66% <0.00%> (+11.90%)	⬆️

... and 251 files with indirect coverage changes

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[dmitry-kharchenko]

Overall LGTM

[TimothyMothra]

is this meant to be a TODO?

[rajkumar-rangaraj]

It's a statement indicating that no exceptions were thrown. Since the existing implementation threw an exception, I had to add it, instead of making test complex.