Disabling calendar policies removes scheduled calendar events

[lucasmrod]

#17230

Fix for the following scenarios:

• Team has only one policy with calendar enabled. Events are created on user calendars. Then the user disables the calendar on such policy. Expected behavior: Events on the user calendar should be cleaned up in that scenario.
• Policy platform is edited (which removes policy_membership entries) and we'd like to have the calendar event removed for the hosts that do not apply anymore.

To cover these scenarios I changed ds.GetTeamHostsPolicyMemberships so that it also returns hosts that have a calendar event AND have no results on policies (returned as passing=1).
E.g. this could happen if there ARE calendar events for a team but with a platform that doesn't match the host (so it has no results).

[codecov]

Codecov Report

Attention: Patch coverage is 40.74074% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 65.33%. Comparing base (9bb1610) to head (4e7626e).
Report is 6 commits behind head on main.

Files	Patch %	Lines
cmd/fleet/calendar_cron.go	5.88%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17882      +/-   ##
==========================================
- Coverage   65.33%   65.33%   -0.01%     
==========================================
  Files        1204     1204              
  Lines      110022   110034      +12     
  Branches     2585     2585              
==========================================
+ Hits        71883    71886       +3     
- Misses      32638    32646       +8     
- Partials     5501     5502       +1     

Flag	Coverage Δ
backend	66.33% <40.74%> (-0.01%)	⬇️

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[getvictor]

LGTM