fix: Restore dotnet-counters tool compatibility

[nrcventura]

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Description

Fixes #3462.

There are 2 sets of changes in this PR.

1. Updates the initialization logic for hybrid agent metrics so that it does not do anything unless metrics support is enabled.
2. Updates the EventSourceName for the ILRepacked EventSource that is used to enable out of process reporting of dimensional metrics.

The first change cleans up the hybrid agent initialization behavior so that it doesn't do anything unless hybrid agent metrics are enabled. This change by itself will restore previous agent behavior where dotnet-counters can be used simultaneously with the agent (when hybrid agent metrics are disabled).

The second change prevents dimensional metrics collected by the agent from being transmitted to a tool such as dotnet-counters, because those dimensional metrics will already be available to tools such as dotnet-counters from the non-ILRepacked version of the DiagnosticSource library.

The ILRepack tool does not have a mechanism for "repacking" event source names within ILRepacked libraries. A new command line tool was added to the build process that directly interacts with Mono.Cecil (similarly to ILRepack) to handle "repacking" the event source name. This tool reports an error if it is unable to find and "repack" the event source name.

I did not find a good way to add a reliable regression test for dotnet-counters compatibility.

Author Checklist

• Unit tests, Integration tests, and Unbounded tests completed
• Performance testing completed with satisfactory results (if required)

Reviewer Checklist

• Perform code review
• Pull request was adequately tested (new/existing tests, performance tests)

[tippmar-nr]

Looks solid. LGTM!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.75%. Comparing base (8518bf3) to head (7c99389).

Files with missing lines	Patch %	Lines
...OpenTelemetryBridge/Metrics/MeterListenerBridge.cs	0.00%	6 Missing ⚠️
...penTelemetryBridge/Metrics/MeterBridgingService.cs	77.77%	1 Missing and 1 partial ⚠️
...metryBridge/Metrics/DynamicMeterListenerWrapper.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3526      +/-   ##
==========================================
- Coverage   81.77%   81.75%   -0.02%     
==========================================
  Files         508      508              
  Lines       34228    34235       +7     
  Branches     4040     4041       +1     
==========================================
- Hits        27990    27989       -1     
- Misses       5270     5279       +9     
+ Partials      968      967       -1     

Flag	Coverage Δ
Agent	82.74% <43.75%> (-0.03%)	⬇️
Profiler	71.75% <ø> (ø)

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

Files with missing lines	Coverage Δ
...metryBridge/Metrics/DynamicMeterListenerWrapper.cs	31.17% <0.00%> (-0.64%)	⬇️
...penTelemetryBridge/Metrics/MeterBridgingService.cs	56.59% <77.77%> (+0.32%)	⬆️
...OpenTelemetryBridge/Metrics/MeterListenerBridge.cs	88.70% <0.00%> (-9.63%)	⬇️

... and 2 files with indirect coverage changes

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