[CASCL-647] Add a subcommand to kubectl plugin to uninstall Karpenter

[L3n41c]

What does this PR do?

Add a subcommand to the kubectl plugin to uninstall Karpenter on a cluster:

kubectl datadog autoscaling cluster uninstall

Motivation

#2301 added a subcommand to install Karpenter.
This PR introduce a subcommend to do the reverse operation.

Additional Notes

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?
No

Describe your test plan

• Create an EKS cluster;
• Install Karpenter on it with kubectl datadog autoscaling cluster install;
• Then validate that it can be uninstalled with kubectl datadog autoscaling cluster uninstall.

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

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 368 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.79%. Comparing base (490d736) to head (df49976).

Files with missing lines	Patch %	Lines
...datadog/autoscaling/cluster/uninstall/uninstall.go	0.00%	242 Missing ⚠️
...l-datadog/autoscaling/cluster/common/k8s/object.go	0.00%	33 Missing ⚠️
...datadog/autoscaling/cluster/common/aws/aws-auth.go	0.00%	29 Missing ⚠️
...g/autoscaling/cluster/common/aws/cloudformation.go	0.00%	29 Missing ⚠️
...tl-datadog/autoscaling/cluster/common/helm/helm.go	0.00%	16 Missing ⚠️
...ctl-datadog/autoscaling/cluster/install/install.go	0.00%	16 Missing ⚠️
cmd/kubectl-datadog/autoscaling/cluster/cluster.go	0.00%	1 Missing ⚠️
...og/autoscaling/cluster/install/k8s/ec2nodeclass.go	0.00%	1 Missing ⚠️
...atadog/autoscaling/cluster/install/k8s/nodepool.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2424      +/-   ##
==========================================
- Coverage   37.32%   36.79%   -0.53%     
==========================================
  Files         290      291       +1     
  Lines       24720    25072     +352     
==========================================
  Hits         9226     9226              
- Misses      14781    15133     +352     
  Partials      713      713              

Flag	Coverage Δ
unittests	36.79% <0.00%> (-0.53%)	⬇️

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

Files with missing lines	Coverage Δ
cmd/kubectl-datadog/autoscaling/cluster/cluster.go	0.00% <0.00%> (ø)
...og/autoscaling/cluster/install/k8s/ec2nodeclass.go	0.00% <0.00%> (ø)
...atadog/autoscaling/cluster/install/k8s/nodepool.go	0.00% <0.00%> (ø)
...tl-datadog/autoscaling/cluster/common/helm/helm.go	0.00% <0.00%> (ø)
...ctl-datadog/autoscaling/cluster/install/install.go	12.76% <0.00%> (-0.14%)	⬇️
...datadog/autoscaling/cluster/common/aws/aws-auth.go	32.69% <0.00%> (ø)
...g/autoscaling/cluster/common/aws/cloudformation.go	0.00% <0.00%> (ø)
...l-datadog/autoscaling/cluster/common/k8s/object.go	0.00% <0.00%> (ø)
...datadog/autoscaling/cluster/uninstall/uninstall.go	0.00% <0.00%> (ø)

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[L3n41c]

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[L3n41c]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

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[chatgpt-codex-connector]

Fail uninstall when cleanup steps error

Errors from each cleanup step are only logged and ignored (deleteKarpenterNodePools/deleteKarpenterEC2NodeClasses at these lines), yet the command later prints a success banner and returns nil. If the user lacks RBAC or CRDs are missing, those deletions will fail but the CLI will still exit 0, leaving Karpenter resources and AWS infrastructure behind with no signal to automation that the uninstall was incomplete. This should surface failures rather than treating them as warnings.

Useful? React with 👍 / 👎.