PROF-10073: Add suport for feature.profiling

[szegedi]

What does this PR do?

This PR adds the Continuous Profiling feature activation under the feature.profiling field in the DatadogAgent CRD. Its only goal is to propagate environment variables to the cluster-agent admission controller.

• This PR depends on cluster-agent interpreting the environment variable: PROF-10073: Read and propagate helm config for profiling datadog-agent#27185, slated for 7.57.0 agent release. Earlier cluster agents will ignore the setting.
• Sister PR of PROF-10073: Add support for datadog.profiling helm-charts#1471
• This PR is modeled after [ASM] product features activation #1165 which did pretty much the same SSI enablement for ASM products.

Motivation

Part of Single Step Activation for the Continuous Profiler.

Minimum Agent Versions

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

• Cluster Agent: 7.57.0 (feature will be ignored by earlier versions.)

Describe your test plan

With admission controller enabled, the environment variable DD_ADMISSION_CONTROLLER_AUTO_INSTRUMENTATION_PROFILING_ENABLED will be set with the value of features.profiling.enabled from the manifest, e.g.:

apiVersion: datadoghq.com/v1alpha1
kind: DatadogAgent
metadata:
  name: datadog
spec:
  features:
     profiling:
       enabled: auto

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

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[eliottness]

LGTM except for the comment left open ☝️