ref(similarity): Add project option to enable ingestion after backfill

[jangjodi]

Add enable ingestion flag to backfill endpoint
Add enable ingestion flag in backfill
If the flag is enabled, add sentry:similarity_backfill_completed to project options (to be checked in ingestion)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.17%. Comparing base (dd35653) to head (357d094).
Report is 17 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #74586   +/-   ##
=======================================
  Coverage   78.17%   78.17%           
=======================================
  Files        6693     6693           
  Lines      299544   299558   +14     
  Branches    51564    51566    +2     
=======================================
+ Hits       234170   234183   +13     
- Misses      59057    59058    +1     
  Partials     6317     6317           

Files	Coverage Δ
...ject_backfill_similar_issues_embeddings_records.py	93.33% <100.00%> (+0.74%)	⬆️
...ping/backfill_seer_grouping_records_for_project.py	91.46% <ø> (ø)
src/sentry/tasks/embeddings_grouping/utils.py	91.85% <100.00%> (+0.09%)	⬆️

... and 6 files with indirect coverage changes

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ AssertionError: assert {'request_has...ersion': 'v0'} == {'request_has...ersion': 'v0'} pytest.runtest.protocol tests/sentry/tasks/test... View Issue
• ‼️ AssertionError: assert {'request_has...ersion': 'v0'} == {'request_has...ersion': 'v0'} pytest.runtest.protocol tests/sentry/tasks/test... View Issue

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