Adding vulnerability sorting by project count

[krishardy]

Description

This makes the following improvement in the Vulnerability view in the UI:

• The vulnerability list is sortable by the number of affected projects

Addressed Issue

N/A

Additional Details

Moved the getVulnerabilities() logic to a SqlQuery instead of building it piecemeal in code.
Tests have been written and pass.
Companion UI PR: DependencyTrack/frontend#1859

Checklist

• I have read and understand the contributing guidelines
• [n/a] This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• [n/a] This PR introduces changes to the database model, and I have updated the migration changelog accordingly
• [n/a] This PR introduces new or alters existing behavior, and I have updated the documentation accordingly
• [n/a] This PR is a substantial change (per the ADR criteria), and I have added an ADR under docs/adr/

[owasp-dt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 7 complexity

Metric	Results
Complexity	7

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