Fix: member audit log resolution after transaction commit

[Mauraza]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

This fixes issue #23557 by resolving project member audit entries without depending on the original request transaction. As a result, member audit logs remain readable even after the request context has ended.

Issue being fixed

Fixes #23557

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 66.39%. Comparing base (5713e11) to head (e5daace).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23586      +/-   ##
==========================================
+ Coverage   66.37%   66.39%   +0.01%     
==========================================
  Files        1073     1073              
  Lines      117750   117751       +1     
  Branches     2965     2965              
==========================================
+ Hits        78161    78178      +17     
+ Misses      35286    35273      -13     
+ Partials     4303     4300       -3     

Flag	Coverage Δ
unittests	66.39% <100.00%> (+0.01%)	⬆️

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Files with missing lines	Coverage Δ
src/pkg/auditext/event/member/member.go	71.32% <100.00%> (+3.72%)	⬆️

... and 5 files with indirect coverage changes

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[Copilot]

Pull request overview

Fixes member audit-log resolution after request transactions finish.

Changes:

• Replaces transaction-bound ORM contexts with fresh ORM instances.
• Adds partial unit coverage for ORM context handling.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
member.go	Avoids querying through completed transactions.
member_test.go	Tests non-transactional context preservation.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.