chore: Supportability metrics for hybrid agent tracing

[tippmar-nr]

• Adds supportability metrics for hybrid agent:
  • Supportability/Tracing/DotNet/OpenTelemetryBridge/{Enabled|Disabled} to indicate whether the tracing feature of the Open Telemetry bridge is enabled as per agent spec
  • Supportability/DotNet/OpenTelemetryBridge/{Enabled|Disabled} to indicate state of global otel bridge configuration
• Renames the DotNet metric names constant that uses goofy capitalization (DotNET) to DotNETObsolete as well as renaming SupportabilityDotnetPs which used inconsistent casing (Dotnet) to SupportabilityDotnetPsObsolete. Updates existing metrics as needed to ensure no names were changed and introduces a new DotNet and SupportabilityDotNetPs metric names constants that uses a typical camel case capitalization.
• Adds a new configuration OpenTelemetryBridgeTracingEnabled to control whether the tracing (ActivityBridge) feature is enabled. This new configuration defaults to true for now. NOTE: This change does not alter the existing appSettings based configuration or use the new environment variable names defined in the tracing spec; those changes will come after the metric bridge service implementation is completed.
• Updates AgentManager to use the global configuration OpenTelemetryBridgeEnabled when determining whether to start the otel ActivityBridge service and updates ActivityBridge.Start() to check OpenTelemetryBridgeTracingEnabled to determine whether it should start.
• Updates unit tests as needed.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.33%. Comparing base (e2a8109) to head (49a8723).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3327      +/-   ##
==========================================
- Coverage   82.33%   82.33%   -0.01%     
==========================================
  Files         495      495              
  Lines       32043    32059      +16     
  Branches     3716     3719       +3     
==========================================
+ Hits        26383    26396      +13     
- Misses       4789     4792       +3     
  Partials      871      871              

Flag	Coverage Δ
Agent	83.56% <100.00%> (-0.01%)	⬇️
Profiler	70.40% <ø> (ø)

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

Files with missing lines	Coverage Δ
...elic/Agent/Core/AgentHealth/AgentHealthReporter.cs	90.98% <100.00%> (+0.10%)	⬆️
...c/Agent/Core/Configuration/DefaultConfiguration.cs	89.55% <100.00%> (+<0.01%)	⬆️
.../Agent/Core/Configuration/ReportedConfiguration.cs	95.34% <100.00%> (+0.01%)	⬆️
...c/Agent/NewRelic/Agent/Core/Metrics/MetricNames.cs	93.08% <100.00%> (+0.09%)	⬆️
...c/Agent/Core/OpenTelemetryBridge/ActivityBridge.cs	77.85% <100.00%> (ø)

... and 1 file with indirect coverage changes

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