fix: logging of unredacted payloads through OperationDescription in audit events

[marevers]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

Changes the OperationDescription field in audit events to have the redacted payload, rather than the original payload. This makes sure secrets are properly redacted in the visible log entries in the Harbor portal.

Issue being fixed

Fixes #22878

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 66.00%. Comparing base (c8c11b4) to head (b2a1ec7).
⚠️ Report is 678 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #22879       +/-   ##
===========================================
+ Coverage   45.36%   66.00%   +20.63%     
===========================================
  Files         244     1074      +830     
  Lines       13333   116417   +103084     
  Branches     2719     2937      +218     
===========================================
+ Hits         6049    76844    +70795     
- Misses       6983    35325    +28342     
- Partials      301     4248     +3947     

Flag	Coverage Δ
unittests	66.00% <100.00%> (+20.63%)	⬆️

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

Files with missing lines	Coverage Δ
src/pkg/auditext/event/config/config.go	78.57% <100.00%> (ø)

... and 988 files with indirect coverage changes

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