chore(commit-context): Remove unused feature flag

[leeandher]

With #65346 and https://github.com/getsentry/getsentry/pull/12983 merged, self-hosted and all organizations on SaaS now have access to the commit-context feature for suspect commits. The feature flag can be safely removed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.30%. Comparing base (f9c2ffd) to head (fb61f5c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #66345   +/-   ##
=======================================
  Coverage   84.30%   84.30%           
=======================================
  Files        5309     5309           
  Lines      237200   237200           
  Branches    41035    41035           
=======================================
+ Hits       199960   199963    +3     
+ Misses      37021    37018    -3     
  Partials      219      219           

Files	Coverage Δ
src/sentry/conf/server.py	90.12% <ø> (ø)
src/sentry/features/permanent.py	100.00% <ø> (ø)
src/sentry/tasks/post_process.py	91.60% <100.00%> (ø)

... and 8 files with indirect coverage changes

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ AssertionError: b'{"detail":"Event not found"}' pytest.runtest.protocol tests/sentry/api/endpoi... View Issue

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