fix yamllint workflow and refresh versions

[danish9039]

This follow-up continues the work from #3418 on top of kubeflow/unify-yamllint, as requested.

The branch had one failing GitHub Actions job, format_YAML_files, but the failure was not caused by a YAML formatting violation in the repository. The workflow step that prints the YAML formatting guidance had an unterminated quoted echo block, so the job failed in the shell before yamllint ran. The same branch also had two related regressions in the linting setup: the YAML changed-file filter had been rewritten into a form that cannot match git diff --name-only output, and the top-level exclude value in .pre-commit-config.yaml used an invalid Python regular expression.

This PR fixes that workflow regression and completes the requested version refresh in the same area. It pins the workflow-installed yamllint version to 1.38.0, updates the pre-commit hook versions for yamllint, black, and shellcheck-py, replaces the invalid top-level pre-commit exclusion with a valid regex, and restores a working YAML changed-file filter while keeping the explicit --config-file .yamllint.yaml behavior.

Verification:

• pre-commit run --files .pre-commit-config.yaml .github/workflows/linting_bash_python_yaml_files.yaml .yamllint.yaml
• local bash -n validation of the extracted YAML Formatting Guidelines shell snippet

[github-actions]

Welcome to the Kubeflow Manifests Repository

Thanks for opening your first PR. Your contribution means a lot to the Kubeflow community.

Before making more PRs:
Please ensure your PR follows our Contributing Guide.
Please also be aware that many components are synchronizes from upstream via the scripts in /scripts.
So in some cases you have to fix the problem in the upstream repositories first, but you can use a PR against kubeflow/manifests to test the platform integration.

Community Resources:

• CNCF Slack channels: https://www.kubeflow.org/docs/about/community/#kubeflow-slack-channels
• Community meetings: https://www.kubeflow.org/docs/about/community/

Thanks again for helping to improve Kubeflow.

[Copilot]

Pull request overview

Fixes the YAML linting automation and refreshes related lint tool versions to restore a passing, accurate format_YAML_files GitHub Actions job.

Changes:

• Pin workflow-installed yamllint to 1.38.0 and fix the unterminated YAML-guidance echo block.
• Restore a working “changed YAML files” selection pipeline for the workflow.
• Refresh pre-commit hook versions and replace the invalid top-level pre-commit exclude with a valid regex.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.pre-commit-config.yaml	Updates hook versions and fixes the repository-wide pre-commit exclusion regex.
.github/workflows/linting_bash_python_yaml_files.yaml	Fixes the YAML lint workflow guidance block, pins yamllint, and repairs changed-file filtering.

[juliusvonkohout]

Thank you
/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: juliusvonkohout

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [juliusvonkohout]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment