[CECO-1106] DDA config for Admission Controller sidecar injection using selector and profile

[kisungyi92]

What does this PR do?

This PR is following up PR #1207 adding selectors and profiles.

Motivation

CECO-1067

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

Test based on the release v1.6.0

• Run DDA with selectors.objectSelector option in admissionController.agentSidecarInjection.
• Test selectors.namespaceSelector with same structure.

  features:
        selectors:
        - objectSelector:
            matchLabels:
              "testLabel": "testValue"

  features:
        selectors:
        - namespaceSelector:
            matchLabels:
              "testLabel": "testValue"

• Check that the DD_ADMISSION_CONTROLLER_AGENT_SIDECAR_SELECTORS is set to correct map structure.
• Run command : kubectl describe deploy datadog-cluster-agent | grep -i DD_ADMISSION_CONTROLLER_AGENT_SIDECAR

Result #1
      DD_ADMISSION_CONTROLLER_AGENT_SIDECAR_SELECTORS:              [{"objectSelector":{"matchLabels":{"testLabel":"testValue"}}}]
Result #2
      DD_ADMISSION_CONTROLLER_AGENT_SIDECAR_SELECTORS:              [{"namespaceSelector":{"matchLabels":{"testLabel":"testValue"}}}]

• Next, test DDA with profiles option in admissionController.agentSidecarInjection.

  features:
    admissionController:
      agentSidecarInjection:
        enabled: true
        provider: "fargate"
        profiles:
        - env:
          - name: DD_PROCESS_AGENT_PROCESS_COLLECTION_ENABLED
            value: "true"
          resources:
            requests:
              cpu: "400m"
              memory: "256Mi"
            limits:
              cpu: "800m"
              memory: "512Mi"

• Check that the DD_ADMISSION_CONTROLLER_AGENT_SIDECAR_PROFILES is set to correct map structure.
• Run command : kubectl describe deploy datadog-cluster-agent | grep -i DD_ADMISSION_CONTROLLER_AGENT_SIDECAR

Result : 
     DD_ADMISSION_CONTROLLER_AGENT_SIDECAR_PROFILES:               [{"env":[{"name":"DD_PROCESS_AGENT_PROCESS_COLLECTION_ENABLED","value":"true"}],"resources":{"limits":{"cpu":"800m","memory":"512Mi"},"requests":{"cpu":"400m","memory":"256Mi"}}}]

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.66667% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 59.53%. Comparing base (2d393ee) to head (d107ce5).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1209      +/-   ##
==========================================
+ Coverage   59.33%   59.53%   +0.20%     
==========================================
  Files         176      177       +1     
  Lines       22124    22322     +198     
==========================================
+ Hits        13127    13290     +163     
- Misses       8192     8219      +27     
- Partials      805      813       +8     

Flag	Coverage Δ
unittests	59.53% <86.66%> (+0.20%)	⬆️

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

Files	Coverage Δ
apis/datadoghq/v2alpha1/datadogagent_types.go	100.00% <ø> (ø)
...atadogagent/feature/admissioncontroller/feature.go	83.15% <86.66%> (+0.69%)	⬆️

... and 5 files with indirect coverage changes

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[maycmlee]

A couple of small suggestions