Remove w3c check HttpClient

[vishweshbankwar]

The check is no longer needed as we have stopped supporting 2.x versions.
Fixes #.

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

[codecov]

Codecov Report

Merging #3235 (ee35de9) into main (1bdb512) will increase coverage by 0.25%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3235      +/-   ##
==========================================
+ Coverage   85.30%   85.56%   +0.25%     
==========================================
  Files         261      261              
  Lines        9392     9385       -7     
==========================================
+ Hits         8012     8030      +18     
+ Misses       1380     1355      -25     

Impacted Files	Coverage Δ
...tp/Implementation/HttpHandlerDiagnosticListener.cs	69.31% <100.00%> (-2.27%)	⬇️
...heus/Implementation/PrometheusCollectionManager.cs	82.27% <0.00%> (+2.53%)	⬆️
...metryProtocol/Implementation/ActivityExtensions.cs	91.44% <0.00%> (+2.70%)	⬆️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	82.35% <0.00%> (+5.88%)	⬆️
...xporter.OpenTelemetryProtocol/OtlpTraceExporter.cs	77.27% <0.00%> (+40.90%)	⬆️
...entation/ExportClient/OtlpGrpcTraceExportClient.cs	78.57% <0.00%> (+42.85%)	⬆️