fix(hybridcloud) Remove externalactor.actor_id

[markstory]

This field was removed from django state a few months back in #56534 This field is now causing issues in deletions as foreign key constraints are preventing records from being deleted. Removing the unused column seems like the most efficient solution.

Fixes SENTRY-163E

[codecov]

Codecov Report

Merging #60548 (11c2214) into master (62877ee) will decrease coverage by 0.01%.
Report is 5 commits behind head on master.
The diff coverage is n/a.

❗ Current head 11c2214 differs from pull request most recent head cd3cfa3. Consider uploading reports for the commit cd3cfa3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #60548      +/-   ##
==========================================
- Coverage   80.85%   80.85%   -0.01%     
==========================================
  Files        5185     5185              
  Lines      227915   227925      +10     
  Branches    38344    38345       +1     
==========================================
- Hits       184289   184278      -11     
- Misses      38002    38022      +20     
- Partials     5624     5625       +1     

see 15 files with indirect coverage changes

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0607_drop_externalactor_actorid.py ()

--
-- Custom state/database change combination
--

                    ALTER TABLE "sentry_externalactor" DROP COLUMN actor_id;
                    ;