CI workflow for helm charts and manifests

[lowc1012]

Tracking issue

Closes #4973

Why are the changes needed?

We should be serious about changes to helm charts and manifests, The current CI doesn't ensure manifests are valid against to the schema for Kubernetes.

What changes were proposed in this pull request?

1. Create a new gha workflow to test helm charts if them are changed, and validate generated manifests.
2. We can specify k8s versions that we want to ensure manifests are still valid for that k8s version. (avoiding some apiVersion of resource is deprecated but we don't notice that)

How was this patch tested?

Setup process

1. Install nektos/act to test actions locally
2. Create an json file called event.json, and copy & paste the following code into event.json

{
  "repository": {
    "default_branch": "master"
  }
}

3. Run act pull_request -W .github/workflows/validate-helm-charts.yaml --container-architecture linux/amd64 -e <path to event.json file>

4. The workflow will start. You can change any charts to trigger steps after Detect charts changed (list-changed) in lint-and-test-charts job.

5. As for validate-manifests job, it will use kubeconform for validate manifests under deployments and docker/sandbox-bundled/manifests.

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[lowc1012]

Could we remove deployment/xxx/xxxxx_generated.yaml generated by kustomize?
because it use outdated dependencies such as pytorch-operator
c.c @pingsutw

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.99%. Comparing base (fd42f65) to head (1f36148).
Report is 20 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5027      +/-   ##
==========================================
- Coverage   58.99%   58.99%   -0.01%     
==========================================
  Files         645      645              
  Lines       55542    55548       +6     
==========================================
+ Hits        32769    32770       +1     
- Misses      20182    20187       +5     
  Partials     2591     2591              

Flag	Coverage Δ
unittests	58.99% <ø> (-0.01%)	⬇️

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