Add beta support for Agent Data Plane.

[tobz]

What does this PR do?

Adds support for the experimental Agent Data Plane project. This follows a similar path to #1269 where only an experimental CLI flag is exposed for enabling ADP support, and we're leaving the CRDs alone.

Motivation

The ADP deployment model is based around a new container, so Operator changes are necessary for internal testing.

Additional Notes

N/A

Minimum Agent Versions

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

Not tied to a standard Agent version, as this depends on a custom internal-only Datadog Agent build.

Describe your test plan

• Deploy the custom Operator image to a designated staging cluster, and enable the newly-added CLI flag.
• Update that cluster to use an ADP-specific image for the Datadog Agent.
• Observe that the new container for ADP is created.

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

[github-actions]

This pull request does not contain a valid label. Please add one of the following labels: bug, enhancement, refactoring, documentation, tooling, dependencies

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 22.78481% with 61 lines in your changes missing coverage. Please review.

Project coverage is 47.01%. Comparing base (93b9f8f) to head (befe131).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...ontrollers/datadogagent/component/agent/default.go	0.00%	36 Missing ⚠️
apis/datadoghq/common/common.go	0.00%	16 Missing ⚠️
...lers/datadogagent/feature/enabledefault/feature.go	75.00%	3 Missing and 1 partial ⚠️
...adogagent/component/clusterchecksrunner/default.go	0.00%	3 Missing ⚠️
main.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1383      +/-   ##
==========================================
- Coverage   47.29%   47.01%   -0.29%     
==========================================
  Files         217      217              
  Lines       18710    18839     +129     
==========================================
+ Hits         8849     8857       +8     
- Misses       9399     9520     +121     
  Partials      462      462              

Flag	Coverage Δ
unittests	47.01% <22.78%> (-0.29%)	⬇️

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

Files with missing lines	Coverage Δ
...ers/datadogagent/component/clusteragent/default.go	96.85% <100.00%> (ø)
controllers/datadogagent/controller.go	54.83% <100.00%> (+1.50%)	⬆️
controllers/datadogagent/feature/types.go	26.92% <ø> (ø)
controllers/datadogagent/override/global.go	41.42% <100.00%> (+0.24%)	⬆️
controllers/setup.go	56.66% <100.00%> (+0.36%)	⬆️
main.go	0.00% <0.00%> (ø)
...adogagent/component/clusterchecksrunner/default.go	1.07% <0.00%> (ø)
...lers/datadogagent/feature/enabledefault/feature.go	37.90% <75.00%> (+2.30%)	⬆️
apis/datadoghq/common/common.go	12.98% <0.00%> (-1.94%)	⬇️
...ontrollers/datadogagent/component/agent/default.go	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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