fix(ms): remove duplicate advisories

[MaineK00n]

What did you implement:

It is rare for the same KB to be added to the distro advisory by multiple products because the KB is basically filtered by Product. However, when scanning without determining the OS, duplicate distro advisories may be added. This PR corrects this problem and makes the KBs added to the distro advisory unique.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES

Reference

[sadayuki-matsuno]

LGTM