feat: Include custom labels for NEW_RELIC_LABELS and also apply podlabel "newrelic-k8s-agents-operator-version"

[ramkrishankumarN]

Description

https://new-relic.atlassian.net/browse/NR-311790

        env:
         - name: NEW_RELIC_LABELS
           value: "team:k8s"

Given this user provided label, the final value of NEW_RELIC_LABELS will be "team:k8s,operator:auto-injection"

2. Add pod label "k8s_agents_operator_version:{appVersionNo}" to every mutated pod.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.31%. Comparing base (5c8db05) to head (064307a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
+ Coverage   59.90%   60.31%   +0.40%     
==========================================
  Files          22       22              
  Lines        1519     1532      +13     
==========================================
+ Hits          910      924      +14     
+ Misses        539      538       -1     
  Partials       70       70              

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[elucus]

@ramkrishankumarN I'm not sure it should be a comma. I think agents are using ; as the delimiter ex: https://docs.newrelic.com/docs/apm/agents/java-agent/configuration/java-agent-configuration-config-file/#labels