feat: Add Playwright setup

[bupd]

Comprehensive Summary of your change

This adds the first step of proposal goharbor/community#268

• Add configs related to playwright
• Add initial tests
• Add github action to run playwright tests.

note

one best thing about this is: https://github.com/goharbor/harbor/actions/runs/18526331097/artifacts/4275726026
test run: https://github.com/goharbor/harbor/actions/runs/18526331097/job/52797918784?pr=22462
use this to view the test-report and why did it fail. we will get a screenshot a video and a error context.

Screenshots

Issue being fixed

Fixes #22134

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"
• 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.85%. Comparing base (c8c11b4) to head (ce207d4).
⚠️ Report is 575 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #22462       +/-   ##
===========================================
+ Coverage   45.36%   65.85%   +20.49%     
===========================================
  Files         244     1073      +829     
  Lines       13333   116036   +102703     
  Branches     2719     2931      +212     
===========================================
+ Hits         6049    76421    +70372     
- Misses       6983    35377    +28394     
- Partials      301     4238     +3937     

Flag	Coverage Δ
unittests	65.85% <ø> (+20.49%)	⬆️

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see 987 files with indirect coverage changes

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[bupd]

/label release-note/ignore