Atomic vulnerability count calculations

[mostlikelee]

cherry-pick: #35317

[codecov]

Codecov Report

❌ Patch coverage is 67.34694% with 16 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (rc-minor-fleet-v4.77.0@78cbfd5). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
server/datastore/mysql/vulnerabilities.go	67.34%	9 Missing and 7 partials ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##             rc-minor-fleet-v4.77.0   #35705   +/-   ##
=========================================================
  Coverage                          ?   66.21%           
=========================================================
  Files                             ?     2102           
  Lines                             ?   178143           
  Branches                          ?     7382           
=========================================================
  Hits                              ?   117954           
  Misses                            ?    49380           
  Partials                          ?    10809           

Flag	Coverage Δ
backend	67.86% <67.34%> (?)

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