revert change of artifact event

[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.

[chlins]

lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-2.12.0@7201b3b). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                @@
##             release-2.12.0   #21278   +/-   ##
=================================================
  Coverage                  ?   68.79%           
=================================================
  Files                     ?      802           
  Lines                     ?   100791           
  Branches                  ?        0           
=================================================
  Hits                      ?    69340           
  Misses                    ?    27640           
  Partials                  ?     3811           

Flag	Coverage Δ
unittests	68.79% <100.00%> (?)

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

Files with missing lines	Coverage Δ
src/controller/artifact/controller.go	62.15% <100.00%> (ø)