feat: add new github action for tidb-operator-publish release v1.x

[lybcodes]

This PR migrate tidb-operator-release job on CD.pingcap.net to GitHub action job style to make it own easy feedback and triggers, also improving maintainability.

original jenkins job:

• https://cd.pingcap.net/job/release-tidb-operator/

[ti-chi-bot]

Hi @lybcodes. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.47%. Comparing base (c23a794) to head (967ee03).
⚠️ Report is 64 commits behind head on release-1.6.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.6    #6612      +/-   ##
===============================================
+ Coverage        57.20%   57.47%   +0.27%     
===============================================
  Files              259      261       +2     
  Lines            33233    38057    +4824     
===============================================
+ Hits             19010    21875    +2865     
- Misses           12290    14109    +1819     
- Partials          1933     2073     +140     

Flag	Coverage Δ
unittest	57.47% <ø> (+0.27%)	⬆️

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[lybcodes]

The chaos job failed due to "no space left on device". It seems the runner has insufficient disk space, and this is unrelated to the current change. Rerun the job.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csuzhangxc

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• OWNERS [csuzhangxc]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-12-17 02:48:16.776937447 +0000 UTC m=+1614041.590715019: ☑️ agreed by csuzhangxc.