Delete project member when delete project

[stonezdj]

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 #19523 (6db2358) into main (bfd44b9) will increase coverage by 0.01%.
The diff coverage is 35.29%.

@@            Coverage Diff             @@
##             main   #19523      +/-   ##
==========================================
+ Coverage   67.50%   67.51%   +0.01%     
==========================================
  Files         988      988              
  Lines      108780   108792      +12     
  Branches     2737     2737              
==========================================
+ Hits        73431    73450      +19     
+ Misses      31384    31374      -10     
- Partials     3965     3968       +3     

Flag	Coverage Δ
unittests	67.51% <35.29%> (+0.01%)	⬆️

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

Files	Coverage Δ
src/pkg/member/manager.go	23.52% <100.00%> (+17.27%)	⬆️
src/controller/event/handler/internal/project.go	13.04% <0.00%> (-13.05%)	⬇️
src/pkg/member/dao/dao.go	71.79% <40.00%> (-1.72%)	⬇️

... and 6 files with indirect coverage changes

[chlins]

lgtm