Handle query query param for the fleet maintained apps list endpoint

[ghernandez345]

support the query query param for the GET /fleet_maintained_apps endpoint

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (feat-fleet-app-library@35b4f20). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
server/datastore/mysql/maintained_apps.go	33.33%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##             feat-fleet-app-library   #22501   +/-   ##
=========================================================
  Coverage                          ?   65.24%           
=========================================================
  Files                             ?     1502           
  Lines                             ?   117350           
  Branches                          ?     3564           
=========================================================
  Hits                              ?    76564           
  Misses                            ?    33671           
  Partials                          ?     7115           

Flag	Coverage Δ
backend	66.51% <33.33%> (?)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.