bump base to v2.15.0

[wy65701436]

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.89%. Comparing base (c8c11b4) to head (5c2f955).
⚠️ Report is 552 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #22316       +/-   ##
===========================================
+ Coverage   45.36%   65.89%   +20.52%     
===========================================
  Files         244     1072      +828     
  Lines       13333   115932   +102599     
  Branches     2719     2927      +208     
===========================================
+ Hits         6049    76393    +70344     
- Misses       6983    35304    +28321     
- Partials      301     4235     +3934     

Flag	Coverage Δ
unittests	65.89% <ø> (+20.52%)	⬆️

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see 986 files with indirect coverage changes

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[chlins]

lgtm

[bupd]

/lgtm

[MinerYang]

lgtm