feat(group-attributes): Add migration to backfill group attributes

[snigdhas]

This migration was run before as 0641_backfill_group_attributes. At that time, the self-hosted consumer wasn't ready so the backfill was a noop. Recommitting this migration so it can be run again for self-hosted customers. We won't need to run this for SaaS/ST.

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0700_backfill_group_priority_to_self_hosted.py ()

--
-- Raw Python operation
--
-- THIS OPERATION CANNOT BE WRITTEN AS SQL

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.68%. Comparing base (b8a12ef) to head (e4f7623).
Report is 1 commits behind head on master.

❗ Current head e4f7623 differs from pull request most recent head 8d74ff6. Consider uploading reports for the commit 8d74ff6 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #69071       +/-   ##
===========================================
+ Coverage   42.36%   79.68%   +37.32%     
===========================================
  Files        6477     6429       -48     
  Lines      288062   285231     -2831     
  Branches    49628    49129      -499     
===========================================
+ Hits       122032   227283   +105251     
+ Misses     163577    57557   -106020     
+ Partials     2453      391     -2062     

see 4621 files with indirect coverage changes

[wedamija]

We need this for ST customers, just not saas. So we should run this using the migration tool, and just kill the US and DE runs

[scefali]

Thanks for making this PR. Just to be clear, we need to land this change first so the attribute consumer is enabled: https://github.com/getsentry/sentry/pull/68633/files#diff-c4bf5bc2eae9efe5e948b5deda98c34fafd95674ae376aaf790c21a039e59f91L1897

[wedamija]

lgtm, let's also null out the old migration if we haven't already, no need to run it twice in self hosted

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0704_backfill_group_attributes_to_self_hosted.py ()

--
-- Raw Python operation
--
-- THIS OPERATION CANNOT BE WRITTEN AS SQL

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0709_backfill_group_attributes_to_self_hosted.py ()

--
-- Raw Python operation
--
-- THIS OPERATION CANNOT BE WRITTEN AS SQL

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0711_backfill_group_attributes_to_self_hosted.py ()

--
-- Raw Python operation
--
-- THIS OPERATION CANNOT BE WRITTEN AS SQL