chore: automate release process with GitHub Actions

[Krishna-kg732]

What this PR does / why we need it:

Automates the Kubeflow Trainer release process using GitHub Actions, including version validation, changelog generation, tag creation, and publishing releases.

Which issue(s) this PR fixes :
Fixes #2155

Checklist:

[google-oss-prow]

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[github-actions]

🎉 Welcome to the Kubeflow Trainer! 🎉

Thanks for opening your first PR! We're happy to have you as part of our community 🚀

Here's what happens next:

• If you haven't already, please check out our Contributing Guide for repo-specific guidelines and the Kubeflow Contributor Guide for general community standards.
• Our team will review your PR soon! cc @kubeflow/kubeflow-trainer-team

Join the community:

• Slack: Join our #kubeflow-trainer Slack channel.
• Meetings: Attend the Kubeflow AutoML and Training Working Group bi-weekly meetings.

Feel free to ask questions in the comments if you need any help or clarification!
Thanks again for contributing to Kubeflow! 🙏

[jaiakash]

@Krishna-kg732 can you run a sample workflow and share the release notes on your fork.

[jaiakash]

Hi @Krishna-kg732 Thanks for your PR. I have closed #3231 since its duplicate.

For this PR, please do the necessary changes and check why Go Unit test are failing.. Also share the sample release here on GitHub.

[Krishna-kg732]

Hey @jaiakash , the go unit tests were failing due to coveralls outage , if you could re run the tests it would go away

sample release with all previous version tags fetched(v99.0.0) :

test-release(v99.0.0)

-Thanks