[APM Onboarding] Use creation timestamp and UID of DatadogAgent as env vars for APM Telemetry KPIs

[liliyadd]

What does this PR do?

Move generation of DD_INSTALLATION_ID and DD_INSTALLATION_TIME from Datadog Operator to using values generated during DatadogAgent creation.

Motivation

https://datadoghq.atlassian.net/browse/CECO-1087

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. Created Datadog Operator image with the PR change. Deployed it to the test cluster together with DatadogAgent CRD.
2. Ran kubectl apply -f datadog-agent.yaml to. create CR, DA and DCA.
   On CR:

apiVersion: datadoghq.com/v2alpha1
kind: DatadogAgent
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"datadoghq.com/v2alpha1","kind":"DatadogAgent","metadata":{"annotations":{},"name":"datadog","namespace":"default"},"spec":{"global":{"clusterName":"apm-onboarding-injection","credentials":{"apiSecret":{"keyName":"api-key","secretName":"datadog-secret2"}},"site":"datad0g.com"}}}
  creationTimestamp: "2024-04-29T22:20:07Z"
  finalizers:
  - finalizer.agent.datadoghq.com
  generation: 1
  name: datadog
  namespace: default
  resourceVersion: "302000248"
  uid: b50e91aa-2744-4ee4-b89f-64c8bf8cf355

    - name: DD_INSTRUMENTATION_INSTALL_ID
      value: b50e91aa-2744-4ee4-b89f-64c8bf8cf355
    - name: DD_INSTRUMENTATION_INSTALL_TIME
      value: "1714429207"

4. DA and DCA are created with the following env vars:
   • name: DD_INSTRUMENTATION_INSTALL_ID
     value: b50e91aa-2744-4ee4-b89f-64c8bf8cf355
   • name: DD_INSTRUMENTATION_INSTALL_TIME
     value: "1714429207"

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 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 59.54%. Comparing base (29510eb) to head (b8696dd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1157   +/-   ##
=======================================
  Coverage   59.54%   59.54%           
=======================================
  Files         174      174           
  Lines       21510    21510           
=======================================
  Hits        12809    12809           
  Misses       7930     7930           
  Partials      771      771           

Flag	Coverage Δ
unittests	59.54% <0.00%> (ø)

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

Files	Coverage Δ
...ontrollers/datadogagent/component/agent/default.go	0.00% <0.00%> (ø)

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