[Backport release-1.8] Chore: add e2e ci env bootstrap & remove multlcluster legacy rollout ci #5926

[Somefive]

Description of your changes

Cherry-pick #5926 to release-1.8.

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: +5.13 🎉

Comparison is base (e528902) 55.94% compared to head (19bd518) 61.08%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.8    #5939      +/-   ##
===============================================
+ Coverage        55.94%   61.08%   +5.13%     
===============================================
  Files              178      217      +39     
  Lines            27404    30776    +3372     
===============================================
+ Hits             15331    18798    +3467     
+ Misses           10561    10259     -302     
- Partials          1512     1719     +207     

Flag	Coverage Δ
core-unittests	55.93% <ø> (-0.02%)	⬇️
e2e-multicluster-test	25.59% <ø> (?)
e2e-rollout-tests	22.39% <ø> (?)
e2etests	26.62% <ø> (?)

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see 119 files with indirect coverage changes

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