Support oomKill, tcpQueueLength features on GKE COS via provider annotation

[levan-m]

What does this PR do?

Support oomKill, tcpQueueLength GKE COS provider via annotation (no introspection).

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

1. Provision GKE cluster with COS nodes
2. Install Operator
3. Apply DDA with two features enabled.

apiVersion: datadoghq.com/v2alpha1
kind: DatadogAgent
metadata:
  name: datadog-agent
spec:
  global:
    credentials:
      apiSecret:
        secretName: datadog-secret
        keyName: api-key
      appSecret:
        secretName: datadog-secret
        keyName: app-key
    clusterName: cos-test
  features:
    oomKill:
      enabled: true
    tcpQueueLength:
      enabled: true

4. DS is create but pod creation is error due to failed to generate spec: failed to mkdir "/usr/src": mkdir /usr/src: read-only file system
5. Add annotation to DDA and reapply

  annotations:
    datadoghq.com/provider: gke-cos

6. Pod starts successfully.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label
• All commits are signed (see: signing commits)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 14.28571% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.64%. Comparing base (97d838e) to head (23dbd5f).

Files with missing lines	Patch %	Lines
...controller/datadogagent/feature/oomkill/feature.go	0.00%	5 Missing ⚠️
...ler/datadogagent/feature/tcpqueuelength/feature.go	0.00%	5 Missing ⚠️
internal/controller/datadogagent/profile.go	50.00%	1 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (14.28%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@                    Coverage Diff                     @@
##           levan-m/providers-ddai    #3011      +/-   ##
==========================================================
- Coverage                   40.65%   40.64%   -0.02%     
==========================================================
  Files                         333      333              
  Lines                       28272    28286      +14     
==========================================================
+ Hits                        11495    11497       +2     
- Misses                      16002    16013      +11     
- Partials                      775      776       +1     

Flag	Coverage Δ
unittests	40.64% <14.28%> (-0.02%)	⬇️

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

Files with missing lines	Coverage Δ
pkg/kubernetes/provider.go	86.36% <ø> (ø)
internal/controller/datadogagent/profile.go	72.00% <50.00%> (-0.61%)	⬇️
...controller/datadogagent/feature/oomkill/feature.go	73.21% <0.00%> (-7.18%)	⬇️
...ler/datadogagent/feature/tcpqueuelength/feature.go	73.43% <0.00%> (-6.23%)	⬇️

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