[ASP.NET Core] Fix broken instrumentation

[vishweshbankwar]

Fixes ##3519 (comment)

This surfaced a gap in our tests. From my brief investigation, the issue is coming from here. This will enable activity creation and once the activity is created we were subscribing to .Start and .Stop events.

We probably need to test with and without builder.Logging.ClearProviders(). Will look in to this separately and update our tests accordingly.

Changes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• Appropriate CHANGELOG.md updated for non-trivial changes
• Design discussion issue #
• Changes in public API reviewed

[CodeBlanch]

LGTM

[codecov]

Codecov Report

Merging #3709 (a56b38b) into main (79ccb27) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3709      +/-   ##
==========================================
- Coverage   87.17%   87.06%   -0.11%     
==========================================
  Files         274      274              
  Lines       10008    10009       +1     
==========================================
- Hits         8724     8714      -10     
- Misses       1284     1295      +11     

Impacted Files	Coverage Δ
...umentation.AspNetCore/AspNetCoreInstrumentation.cs	100.00% <100.00%> (ø)
src/OpenTelemetry/Logs/Pool/LogRecordSharedPool.cs	78.94% <0.00%> (-21.06%)	⬇️
...tation/OpenTelemetryProtocolExporterEventSource.cs	75.00% <0.00%> (-10.00%)	⬇️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	73.52% <0.00%> (-8.83%)	⬇️
...ZPages/Implementation/ZPagesExporterEventSource.cs	56.25% <0.00%> (-6.25%)	⬇️
...Listener/Internal/PrometheusExporterEventSource.cs	61.11% <0.00%> (-5.56%)	⬇️
...ter.ZPages/Implementation/ZPagesActivityTracker.cs	97.14% <0.00%> (-2.86%)	⬇️
...tpListener/Internal/PrometheusCollectionManager.cs	72.52% <0.00%> (-2.20%)	⬇️
...Telemetry/Internal/SelfDiagnosticsEventListener.cs	97.65% <0.00%> (+0.78%)	⬆️
...nTelemetry/Internal/OpenTelemetrySdkEventSource.cs	82.25% <0.00%> (+2.41%)	⬆️
... and 1 more