[cherry-pick]Add GC accessory UI test case

[YangJiao0817]

Fix #19274

Thank you for contributing to Harbor!

Comprehensive Summary of your change

Issue being fixed

Fixes #(issue)

Please indicate you've done the following:

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[codecov]

Codecov Report

Merging #19471 (d23b54d) into release-2.9.0 (86c8dc5) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           release-2.9.0   #19471      +/-   ##
=================================================
- Coverage          67.44%   67.40%   -0.04%     
=================================================
  Files                993      993              
  Lines             108932   108932              
  Branches            2752     2752              
=================================================
- Hits               73471    73431      -40     
- Misses             31509    31551      +42     
+ Partials            3952     3950       -2     

Flag	Coverage Δ
unittests	67.40% <ø> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 9 files with indirect coverage changes

[wy65701436]

lgtm

[chlins]

lgtm