Provider capabilities basic framework and eks.ec2.useHostnameFromFile support

[levan-m]

CONTP-1570

What does this PR do?

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Motivation

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Additional Notes

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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

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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)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.65%. Comparing base (ad3bec8) to head (97d838e).

Files with missing lines	Patch %	Lines
...datadogagent/providercaps/provider_capabilities.go	0.00%	66 Missing ⚠️
...datadogagentinternal/controller_reconcile_agent.go	0.00%	7 Missing ⚠️
...er/datadogagentinternal/controller_reconcile_v2.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                        Coverage Diff                        @@
##           levan-m/drop-feature-provider    #3009      +/-   ##
=================================================================
- Coverage                          40.76%   40.65%   -0.11%     
=================================================================
  Files                                332      333       +1     
  Lines                              28199    28272      +73     
=================================================================
  Hits                               11495    11495              
- Misses                             15929    16002      +73     
  Partials                             775      775              

Flag	Coverage Δ
unittests	40.65% <0.00%> (-0.11%)	⬇️

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

Files with missing lines	Coverage Δ
internal/controller/datadogagent/feature/types.go	22.10% <ø> (ø)
pkg/kubernetes/provider.go	86.36% <ø> (ø)
...er/datadogagentinternal/controller_reconcile_v2.go	0.00% <0.00%> (ø)
...datadogagentinternal/controller_reconcile_agent.go	4.16% <0.00%> (-0.22%)	⬇️
...datadogagent/providercaps/provider_capabilities.go	0.00% <0.00%> (ø)

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[chatgpt-codex-connector]

Mount cloud-init file in single-agent node container

The EKS useHostnameFromFile capability adds DD_HOSTNAME_FILE to all agent containers, but this mount target list excludes apicommon.UnprivilegedSingleAgentContainerName. In single-container strategy, only unprivileged-single-agent runs, so the env var points to /var/lib/cloud/data/instance-id without mounting that host file, which breaks the advertised provider behavior for this mode. Add the single-agent container name to this mount list (or apply the mount to all agent containers) so the file exists where the env var points.

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