feat(crons): Migrate guid to slug

[evanpurkhiser]

Backfills all of the new slugs for existing monitors

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0367_migrate_monitor_guid_to_slug.py ()

--
-- MIGRATION NOW PERFORMS OPERATION THAT CANNOT BE WRITTEN AS SQL:
-- Raw Python operation
--

[codecov]

Codecov Report

Merging #45270 (fa6311c) into master (b761568) will decrease coverage by 5.87%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #45270      +/-   ##
==========================================
- Coverage   74.42%   68.55%   -5.87%     
==========================================
  Files        4700     4695       -5     
  Lines      198544   198404     -140     
  Branches    12022    12022              
==========================================
- Hits       147757   136008   -11749     
- Misses      50525    62134   +11609     
  Partials      262      262              

Impacted Files	Coverage Δ
src/sentry/tasks/integrations/migrate_issues.py	17.77% <0.00%> (-80.00%)	⬇️
src/sentry/web/frontend/oauth_authorize.py	15.38% <0.00%> (-77.70%)	⬇️
src/sentry/testutils/helpers/query.py	21.05% <0.00%> (-73.69%)	⬇️
src/sentry/lang/java/processing.py	27.27% <0.00%> (-72.73%)	⬇️
...rc/sentry/api/endpoints/project_stacktrace_link.py	16.83% <0.00%> (-71.94%)	⬇️
src/sentry/db/deletion.py	12.50% <0.00%> (-71.25%)	⬇️
...sentry/mediators/sentry_app_components/preparer.py	27.41% <0.00%> (-70.97%)	⬇️
src/sentry/lang/java/plugin.py	25.00% <0.00%> (-70.24%)	⬇️
src/sentry/deletions/defaults/organization.py	30.00% <0.00%> (-70.00%)	⬇️
src/sentry/integrations/msteams/webhook.py	23.75% <0.00%> (-69.74%)	⬇️
... and 694 more