Fix wrong scanned artifact count when there are multiple report for an artifact

[stonezdj]

Fix wrong scanned artifact count when there are multiple report for an artifact

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

Merging #18975 (04eb4db) into main (d7ff8bf) will increase coverage by 25.65%.
The diff coverage is n/a.

❗ Current head 04eb4db differs from pull request most recent head 17e03a2. Consider uploading reports for the commit 17e03a2 to get more accurate results

@@             Coverage Diff             @@
##             main   #18975       +/-   ##
===========================================
+ Coverage   44.91%   70.56%   +25.65%     
===========================================
  Files         244      748      +504     
  Lines       13386    95339    +81953     
  Branches     2747        0     -2747     
===========================================
+ Hits         6012    67279    +61267     
- Misses       7069    24437    +17368     
- Partials      305     3623     +3318     

Flag	Coverage Δ
unittests	70.56% <ø> (+25.65%)	⬆️

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

Files Changed	Coverage Δ
src/pkg/securityhub/dao/security.go	50.80% <ø> (ø)

... and 991 files with indirect coverage changes

[wy65701436]

lgtm

[chlins]

lgtm