feat(similarity-embedding): Add endpoint to call backfill script

[jangjodi]

Create endpoint to call the backfill script here

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 99.09502% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 80.02%. Comparing base (f3eae9a) to head (e2adbe0). Report is 3 commits behind head on master.

:exclamation: Current head e2adbe0 differs from pull request most recent head 116a4d8. Consider uploading reports for the commit 116a4d8 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #68751       +/-   ##
===========================================
+ Coverage   54.38%   80.02%   +25.63%     
===========================================
  Files        5485     6507     +1022     
  Lines      231824   291104    +59280     
  Branches    39858    50171    +10313     
===========================================
+ Hits       126082   232944   +106862     
+ Misses     105309    57726    -47583     
- Partials      433      434        +1     

Files	Coverage Δ
...ject_backfill_similar_issues_embeddings_records.py	100.00% <100.00%> (ø)
src/sentry/api/urls.py	100.00% <100.00%> (ø)
src/sentry/conf/server.py	89.44% <100.00%> (+0.01%)	:arrow_up:
src/sentry/features/temporary.py	100.00% <100.00%> (ø)
src/sentry/seer/utils.py	99.21% <100.00%> (ø)
src/sentry/snuba/referrer.py	100.00% <100.00%> (+1.79%)	:arrow_up:
src/sentry/utils/sdk.py	80.66% <ø> (+47.99%)	:arrow_up:
src/sentry/tasks/backfill_seer_grouping_records.py	98.79% <98.79%> (ø)

... and 2275 files with indirect coverage changes

[getsantry[bot]]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀