ref(releases): Function to process a single group resolution

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 91.11111% with 4 lines in your changes missing coverage. Please review.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/api/helpers/group_index/update.py	91.11%	1 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #81119 +/- ## ========================================== - Coverage 78.47% 78.47% -0.01% ========================================== Files 7215 7215 Lines 319847 319849 +2 Branches 44057 44057 ========================================== - Hits 251012 251006 -6 - Misses 62440 62446 +6 - Partials 6395 6397 +2 ```