feat: Include APM Labels in forwarded application logs.

[jaffinito]

Description

Adds labels to in-agent forwarded logs.

• Disabled by default
• Labels are prefixed with "tags."
• Labels are added to common attributes, not individual logs.
• Allows individual labels to be excluded
• Includes unit and integration tests

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)

[jaffinito]

Note: Holding off on merging this until we get some official feature/notice text since this is a cross-agent feature.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.43%. Comparing base (0278836) to head (8b8cb52). Report is 77 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/Agent/Core/Configuration/DefaultConfiguration.cs	93.33%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2831      +/-   ##
==========================================
+ Coverage   81.41%   81.43%   +0.01%     
==========================================
  Files         465      465              
  Lines       29535    29573      +38     
  Branches     3267     3275       +8     
==========================================
+ Hits        24047    24082      +35     
- Misses       4692     4693       +1     
- Partials      796      798       +2     

Flag	Coverage Δ
Agent	82.36% <97.50%> (+0.01%)	:arrow_up:
Profiler	73.07% <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	87.22% <100.00%> (+0.02%)	:arrow_up:
...Relic/Agent/Core/Aggregators/LogEventAggregator.cs	94.84% <100.00%> (+0.10%)	:arrow_up:
.../Agent/Core/Configuration/ReportedConfiguration.cs	95.79% <100.00%> (+0.03%)	:arrow_up:
...erters/LogEventWireModelCollectionJsonConverter.cs	89.58% <100.00%> (+0.94%)	:arrow_up:
.../Agent/NewRelic/Agent/Core/Labels/LabelsService.cs	90.47% <100.00%> (+0.82%)	:arrow_up:
...c/Agent/NewRelic/Agent/Core/Metrics/MetricNames.cs	92.21% <100.00%> (+0.05%)	:arrow_up:
...ent/Core/WireModels/LogEventWireModelCollection.cs	100.00% <100.00%> (ø)
...c/Agent/Core/Configuration/DefaultConfiguration.cs	89.65% <93.33%> (+0.03%)	:arrow_up:

... and 2 files with indirect coverage changes