feat: Selector based injection for all available agents

[danielstokes]

Description

This POC uses selectors rather than annotations to inject instrumentation.
This replicates secrets from the newrelic namespace to the pod namespace as needed. ¹
This merges the main branch and feat/poc features, along with some additional changes

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature / enhancement (non-breaking change which adds functionality)
• Security fix
• Bug fix (non-breaking change which fixes an issue)

Checklist:

• Documentation has been updated
• This change requires changes in testing:
  • unit tests
  • E2E tests

Footnotes

1. There's no mechanism to update/patch/delete secrets in the case of a collision or rotating secrets ↩

[codecov]

Codecov Report

Attention: Patch coverage is 69.64286% with 238 lines in your changes missing coverage. Please review.

Project coverage is 62.09%. Comparing base (5adabea) to head (4a85cbc).

Files with missing lines	Patch %	Lines
src/apm/helper.go	46.55%	80 Missing and 13 partials ⚠️
src/apm/golang.go	63.44%	42 Missing and 11 partials ⚠️
src/api/v1alpha2/instrumentation_webhook.go	47.36%	15 Missing and 5 partials ⚠️
src/instrumentation/podmutator.go	87.20%	11 Missing and 5 partials ⚠️
src/instrumentation/instrumentation_validator.go	0.00%	13 Missing ⚠️
src/api/v1alpha2/zz_generated.deepcopy.go	0.00%	11 Missing ⚠️
src/apm/dotnet.go	87.50%	1 Missing and 4 partials ⚠️
src/api/v1alpha2/instrumentation_types.go	63.63%	4 Missing ⚠️
src/instrumentation/instrumentation_defaulter.go	0.00%	4 Missing ⚠️
src/internal/version/main.go	0.00%	4 Missing ⚠️
... and 5 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #87       +/-   ##
===========================================
+ Coverage   47.74%   62.09%   +14.34%     
===========================================
  Files          13       22        +9     
  Lines         976     1224      +248     
===========================================
+ Hits          466      760      +294     
+ Misses        446      392       -54     
- Partials       64       72        +8     

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[TimPansino]

I'm going to assume you don't actually need review yet from the agent teams who are getting pinged as code owners. When you need our review on something please ping each of the teams either with an @ here or on Slack.

[ramkrishankumarN]

Left some comments and still reviewing it. I believe there is a lot of room to simplify the code by removing couple of interfaces.

[ramkrishankumarN]

LGTM!
🚀 Great stuff @danielstokes