ref: have AlertRule.detection_type code match schema width

[asottile-sentry]

the migration which added this column added it as varchar(32) but this was not reflected in code until now -- fix it with a state-only migration

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0902_detection_type_match_size.py

for 0902_detection_type_match_size in sentry

--
-- Custom state/database change combination
--
-- (no-op)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

⚠️ Parser warning

The parser emitted a warning. Please review your JUnit XML file:

Warning while parsing testcase attributes: Limit of string is 1000 chars, for name, we got 2083 at 1:157237 in /home/runner/work/sentry/sentry/.artifacts/pytest.junit.xml

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #91898       +/-   ##
===========================================
+ Coverage   61.11%   87.62%   +26.51%     
===========================================
  Files       10351    10356        +5     
  Lines      586733   586956      +223     
  Branches    22585    22585               
===========================================
+ Hits       358582   514332   +155750     
+ Misses     227723    72196   -155527     
  Partials      428      428