feat: Add pre-commit hooks for automated code quality checks

[akagami-harsh]

Pull Request Template for Kubeflow Manifests

✏️ Summary of Changes

• Added pre-commit configuration for code quality checks

• Integrated existing linters into pre-commit:

  • black for Python formatting
  • yamllint for YAML validation
  • shellcheck for shell script analysis

• Fixed shellcheck some warnings

• To use these checks locally:

  • Install pre-commit: pip install pre-commit
  • Set up the git hooks: pre-commit install

The checks will now run automatically on git commit, or you can run manually:

📦 Dependencies

List any dependencies or related PRs (e.g., "Depends on #123").

🐛 Related Issues

• part of Reorganize Kubeflow tests #2797

✅ Contributor Checklist

• I have tested these changes with kustomize. See Installation Prerequisites.
• All commits are signed-off to satisfy the DCO check.

---

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[juliusvonkohout]

Why do you want this instead of https://github.com/kubeflow/manifests/blob/master/.github/workflows/linting_bash_python_yaml_files.yaml ?

[akagami-harsh]

Why do you want this instead of https://github.com/kubeflow/manifests/blob/master/.github/workflows/linting_bash_python_yaml_files.yaml ?

With this setup we can run checks locally: pre-commit run, and it was also mention in the issue #2797 (comment)

Additionally, we could start using some nice utilities like pre-commit to automatically run some actions like linters, formatters, check if commit is signed and potentially more. Then, such a pre-commit configuration could be used both from the GH Actions and from the Developer Environment. These are the GH Actions that could benefit from this pattern:

[juliusvonkohout]

Then lets try it out

/lgtm
/approve

maybe add some documentation to the main readme as well.

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: juliusvonkohout

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