fix(migrations) Conditionally remove groupsubscription columns

[markstory]

Get us back to a state where we can add these fields again as environments are inconsistent currently.

Once this is out we'll be able to re-add the schema changes from 543

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0545_remove_groupsubscription_columns.py ()

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

                    ALTER TABLE sentry_groupsubscription DROP CONSTRAINT IF EXISTS subscription_team_or_user_check;
                    ALTER TABLE sentry_groupsubscription DROP COLUMN IF EXISTS team_id;
                    ;

[codecov]

Codecov Report

Merging #55870 (b16d3c0) into master (948f881) will decrease coverage by 0.03%.
Report is 10 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #55870      +/-   ##
==========================================
- Coverage   79.95%   79.93%   -0.03%     
==========================================
  Files        5057     5060       +3     
  Lines      217281   217421     +140     
  Branches    36785    36796      +11     
==========================================
+ Hits       173725   173787      +62     
- Misses      38230    38302      +72     
- Partials     5326     5332       +6     

Files Changed	Coverage
src/sentry/api/endpoints/project_rule_details.py	ø
src/sentry/api/endpoints/project_rules.py	ø
src/sentry/models/groupsubscription.py	100.00%

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[getsentry-bot]

PR reverted: 03285f6