ref(releases): Function to handle resolved in release

[armenzg]

This is the largest code block in update_groups. This moves all related logic into a single function.

For the record, I am not focusing on writing better code but on making it more encapsulated. Proper refactors could happen later.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.03937% with 19 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	84.92%	6 Missing and 13 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #80983 +/- ## =========================================== + Coverage 56.64% 78.50% +21.85% =========================================== Files 7204 7208 +4 Lines 319280 319315 +35 Branches 43982 43959 -23 =========================================== + Hits 180855 250666 +69811 + Misses 133966 62253 -71713 - Partials 4459 6396 +1937 ```

[armenzg]

I will merge this tomorrow. Thanks @snigdhas !