Fix: migrate CI to CNCF machines in release-x branch

[chivalryq]

Description of your changes

🤖 Generated by Copilot at 92d8ffa

Summary

♻️🏃🔧

This pull request switches the runners for several GitHub Actions workflows from aliyun to self-hosted to improve the stability and reliability of the end-to-end tests, the code quality check, and the periodic clean-up task. It also consolidates the end-to-end tests that require multiple clusters into one workflow, e2e-multicluster-test.yml.

aliyun runner
too unstable for testing
self-hosted instead

Walkthrough

• Switch the runner for the end-to-end tests that involve multiple clusters from aliyun to self-hosted to improve stability and reliability (link, link, link)
• Consolidate the end-to-end tests that require multiple clusters into one workflow in .github/workflows/e2e-multicluster-test.yml to simplify the configuration and execution (link, link)
• Switch the runner for the code quality check and the periodic image cleanup task from aliyun to self-hosted to avoid network issues and timeouts (link, link)

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +5.09 🎉

Comparison is base (92be5b3) 55.88% compared to head (92d8ffa) 60.98%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.8    #5952      +/-   ##
===============================================
+ Coverage        55.88%   60.98%   +5.09%     
===============================================
  Files              178      217      +39     
  Lines            27404    30776    +3372     
===============================================
+ Hits             15315    18768    +3453     
+ Misses           10578    10291     -287     
- Partials          1511     1717     +206     

Flag	Coverage Δ
core-unittests	55.90% <ø> (+0.01%)	⬆️
e2e-multicluster-test	25.65% <ø> (?)
e2e-rollout-tests	22.43% <ø> (?)
e2etests	26.45% <ø> (?)

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see 118 files with indirect coverage changes

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