ref: remove self-hosted cloudbuild

[asottile-sentry]

this is now built in GHA -> ghcr

[codecov]

Codecov Report

Merging #61727 (c71ff42) into master (0705c5f) will increase coverage by 0.00%.
Report is 5 commits behind head on master.
The diff coverage is 72.72%.

❗ Current head c71ff42 differs from pull request most recent head 75ebaf7. Consider uploading reports for the commit 75ebaf7 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #61727   +/-   ##
=======================================
  Coverage   81.14%   81.14%           
=======================================
  Files        5188     5188           
  Lines      228458   228458           
  Branches    38316    38316           
=======================================
+ Hits       185380   185383    +3     
+ Misses      37446    37443    -3     
  Partials     5632     5632           

Files	Coverage Δ
...entry/api/endpoints/project_rules_configuration.py	96.66% <100.00%> (ø)
src/sentry/rules/conditions/event_frequency.py	91.76% <100.00%> (ø)
src/sentry/receivers/features.py	85.15% <50.00%> (ø)
src/sentry/receivers/rules.py	95.65% <75.00%> (+13.83%)	⬆️
src/sentry/rules/conditions/high_priority_issue.py	80.64% <50.00%> (-0.61%)	⬇️

... and 8 files with indirect coverage changes

[hubertdeng123]

🚀

[hubertdeng123]

I think removing this broke release build for 23.12.0, so reverting to unblock the release:
https://github.com/getsentry/publish/actions/runs/7254637875/job/19763721097

[getsentry-bot]

PR reverted: ae39b42

[hubertdeng123]

Still not working here, maybe due to the fact that a google cloud build trigger was deleted? 🤔