feat: Automate Triggering of trigger-release.sh After Init Release GitHub Action #20323

[jaehanbyun]

Closes: #20323

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

What I have done:

According to the existing documentation, in Step 2 - Tag Release Branch of the release process, developers are required to manually execute the trigger-release.sh script. This manual step introduces the potential for human error, such as entering the wrong version number or working on the incorrect branch.

To mitigate these risks, I have automated this step by adding a new job called trigger-release to the init-release.yaml workflow. This job automatically executes the trigger-release.sh script after the prepare-release job completes. By doing so, the release process becomes fully automated, eliminating the need for manual script execution and reducing the likelihood of human errors.

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[pasha-codefresh]

It should be executed after init-release PR is merged

[jaehanbyun]

I have created a new workflow file. PTAL!

[pasha-codefresh]

Thank you @jaehanbyun for taking it, left small comment

[codecov]

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[pasha-codefresh]

Thank you, from first glance it looks good, lets discuss it on contribution meeting, and probably we will merge it after 2.13 GA release

Also @34fathombelow should review it

[34fathombelow]

LGTM, only nit is to update the release docs and mention that Step 2 is now automated.
https://github.com/argoproj/argo-cd/blob/master/docs/developer-guide/releasing.md