Remove DatadogAgentEnabled flag

[khewonc]

What does this PR do?

Remove ddai flag to enable ddai by default. A warning has been in the operator that the flag will be removed in 1.27

Split into commits:

• 59e423a: updating comments to remove things like "if ddai is enabled" since it's always enabled now. No actual code changes
• e7093f3: removing the ddai enabled flag + most references
• 4f4d40c: fmt + lint errors. Mostly removing unused code paths
• 9916219: check ddai status instead of dda status to check for the agent status. It took up to an extra 15s (reconcile requeue period) per test as we need a reconcile to copy the relevant ddai status to dda, so directly checking the ddai status is quicker

Motivation

https://datadoghq.atlassian.net/browse/CONTP-1535

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

Write there any instructions and details you may have to test your PR.

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
• All commits are signed (see: signing commits)

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[chatgpt-codex-connector]

Preserve deprecated flag until bundled manifests drop it

Removing the datadogAgentInternalEnabled flag here makes the operator exit with flag provided but not defined in deployments that still pass it, and this repository still ships such a deployment (marketplaces/addon_manifest.yaml includes -datadogAgentInternalEnabled=true at line 18373). In that environment the manager never starts and the pod crashloops, so either a compatibility alias should be kept for one release or all shipped manifests using the old flag must be updated in the same change.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 20.63492% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.62%. Comparing base (59f9e3d) to head (6bd1640).

Files with missing lines	Patch %	Lines
pkg/controller/utils/datadog/metrics_forwarder.go	0.00%	21 Missing ⚠️
cmd/main.go	0.00%	15 Missing ⚠️
pkg/controller/utils/datadog/forwarders_manager.go	0.00%	8 Missing ⚠️
pkg/agentprofile/agent_profile.go	33.33%	4 Missing ⚠️
internal/controller/setup.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2912      +/-   ##
==========================================
- Coverage   41.39%   40.62%   -0.77%     
==========================================
  Files         331      331              
  Lines       28911    28051     -860     
==========================================
- Hits        11969    11397     -572     
+ Misses      16086    15879     -207     
+ Partials      856      775      -81     

Flag	Coverage Δ
unittests	40.62% <20.63%> (-0.77%)	⬇️

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

Files with missing lines	Coverage Δ
internal/controller/datadogagent/controller.go	48.00% <ø> (-44.86%)	⬇️
...troller/datadogagent/controller_reconcile_agent.go	69.23% <ø> (+3.91%)	⬆️
...controller/datadogagent/controller_reconcile_v2.go	52.04% <100.00%> (-9.16%)	⬇️
...ler/datadogagent/controller_reconcile_v2_common.go	13.09% <ø> (-20.82%)	⬇️
...er/datadogagent/controller_reconcile_v2_helpers.go	34.48% <ø> (-30.52%)	⬇️
internal/controller/datadogagent/dependencies.go	54.34% <ø> (ø)
internal/controller/datadogagent/finalizer.go	63.33% <ø> (-8.41%)	⬇️
internal/controller/datadogagent/profile.go	72.60% <100.00%> (ø)
internal/controller/datadogagent/store/store.go	68.39% <ø> (ø)
internal/controller/datadogagent/utils.go	11.57% <ø> (-1.23%)	⬇️
... and 8 more

... and 6 files with indirect coverage changes

---

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🛑 Gate Violations

🎯 1 Code Coverage issue detected

A Patch coverage percentage gate may be blocking this PR.

• Patch coverage: 22.03% (threshold: 80.00%)

ℹ️ Info

🎯 Code Coverage (details)
• Patch Coverage: 22.03%
• Overall Coverage: 40.92% (-0.63%)

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