[otlp] Fix .NET Framework gRPC Export Client Default Success Response Status

[rajkumar-rangaraj]

Fixes #6083 (comment)
Design discussion issue #

Changes

Please provide a brief description of the changes here.

• Modified the incorrect status value set in ExportClientGrpcResponse.
• Existing bug does not impact the telemetry data to be exported. This could be part of next release.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Appropriate CHANGELOG.md files updated for non-trivial changes

[CodeBlanch]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.39%. Comparing base (db828ce) to head (8ae86e4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6099   +/-   ##
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  Coverage   86.39%   86.39%           
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  Files         257      257           
  Lines       11650    11650           
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  Hits        10065    10065           
  Misses       1585     1585