[ASM] product features activation

[eliottness]

What does this PR do?

This PR adds the ASM features activation under the feature.asm field in the DatadogAgent crd. Its only goal is to propagate environment variables to the cluster-agent admission controller (cf. DataDog/datadog-agent#23618)

Sister PR of DataDog/helm-charts#1337
Clone of #1151

Motivation

Part of Single Step Activation for ASM products

Minimum Agent Versions

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

• Cluster Agent: v7.53.0

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

Test Instruction

if the admission controller is not disabled, then there is a OneToOne relation between the DatadogAgent manifest and the env of the cluster agent like this:

• asm.threats.enabled -> DD_ADMISSION_CONTROLLER_AUTO_INSTRUMENTATION_APPSEC_ENABLED
• asm.sca.enabled -> DD_ADMISSION_CONTROLLER_AUTO_INSTRUMENTATION_APPSEC_SCA_ENABLED
• asm.iast.enabled -> DD_ADMISSION_CONTROLLER_AUTO_INSTRUMENTATION_IAST_ENABLED

Manifest example:

apiVersion: datadoghq.com/v1alpha1
kind: DatadogAgent
metadata:
  name: datadog
spec:
  features:
     asm:
       threats:
         enabled: true
       sca:
         enabled: true
       iast:
         enabled: true

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.58140% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 59.23%. Comparing base (8981855) to head (34ad7f9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1165      +/-   ##
==========================================
+ Coverage   59.16%   59.23%   +0.06%     
==========================================
  Files         175      176       +1     
  Lines       21944    22031      +87     
==========================================
+ Hits        12984    13050      +66     
- Misses       8164     8181      +17     
- Partials      796      800       +4     

Flag	Coverage Δ
unittests	59.23% <75.58%> (+0.06%)	⬆️

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

Files	Coverage Δ
apis/datadoghq/v2alpha1/datadogagent_default.go	92.05% <100.00%> (+0.53%)	⬆️
apis/datadoghq/v2alpha1/datadogagent_types.go	100.00% <ø> (ø)
controllers/datadogagent/controller.go	59.25% <ø> (ø)
controllers/datadogagent/feature/asm/feature.go	69.11% <69.11%> (ø)

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[drichards-87]

Left a couple of small suggestions from Docs and approved the PR.

[celenechang]

I believe you also need to "register" this feature here

I made some suggestions, feel free to ping me if you have questions or need another review