[K8s plugin] implement K8S_BASELINE_CLEAN stage

[Warashi]

What this PR does:

• fixed deleteVariantResources's argument
• implement K8S_BASELINE_CLEAN and its test

Why we need it:

to support pipeline sync with k8s plugin

Which issue(s) this PR fixes:

Part of #5764

Does this PR introduce a user-facing change?: No

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

Attention: Patch coverage is 62.79070% with 16 lines in your changes missing coverage. Please review.

Project coverage is 28.08%. Comparing base (1ac2006) to head (541982b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...p/pipedv1/plugin/kubernetes/deployment/baseline.go	60.97%	12 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5913      +/-   ##
==========================================
+ Coverage   28.02%   28.08%   +0.06%     
==========================================
  Files         520      520              
  Lines       56134    56172      +38     
==========================================
+ Hits        15729    15775      +46     
+ Misses      39190    39176      -14     
- Partials     1215     1221       +6     

Flag	Coverage Δ
.	23.74% <ø> (ø)
.-pkg-app-pipedv1-plugin-example	0.00% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	63.84% <62.79%> (+0.81%)	⬆️
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	64.93% <ø> (ø)
.-pkg-app-pipedv1-plugin-wait	35.51% <ø> (ø)
.-pkg-plugin-sdk	49.33% <ø> (ø)
.-tool-actions-gh-release	19.23% <ø> (ø)
.-tool-actions-plan-preview	25.30% <ø> (ø)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (ø)

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[khanhtc1202]

LGTM 👍