Cleanup live queries

[mostlikelee]

#22094

Adjusting the cleanup job for expired live queries to delete all expired in batches of maxCount.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements)
• Added/updated tests
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 12 lines in your changes missing coverage. Please review.

Project coverage is 65.19%. Comparing base (3ca1f5b) to head (1d0ab0d).
Report is 42 commits behind head on main.

Files with missing lines	Patch %	Lines
server/datastore/mysql/activities.go	55.55%	6 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22438      +/-   ##
==========================================
- Coverage   65.21%   65.19%   -0.03%     
==========================================
  Files        1496     1494       -2     
  Lines      117161   116907     -254     
  Branches     3567     3567              
==========================================
- Hits        76408    76216     -192     
+ Misses      33644    33606      -38     
+ Partials     7109     7085      -24     

Flag	Coverage Δ
backend	66.47% <55.55%> (-0.03%)	⬇️

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[lucasmrod]

LGTM!

Pending changes file. With a warning that first run of cleanup cron might cause some performance degradation on live queries / scheduled queries until it finishes.