Add GC accessory API test case

[YangJiao0817]

Fix #19273

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 #19462 (1b5a472) into main (13f4fca) will decrease coverage by 22.54%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main   #19462       +/-   ##
===========================================
- Coverage   67.46%   44.93%   -22.54%     
===========================================
  Files         988      244      -744     
  Lines      108743    13416    -95327     
  Branches     2752     2752               
===========================================
- Hits        73360     6028    -67332     
+ Misses      31430     7083    -24347     
+ Partials     3953      305     -3648     

Flag	Coverage Δ
unittests	44.93% <ø> (-22.54%)	⬇️

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

see 747 files with indirect coverage changes

[wy65701436]

lgtm