chore(database): Remove query source feature flag

[gggritso]

Feature has been released.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2d165ce) 81.30% compared to head (734b2f6) 81.33%.
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #62865      +/-   ##
==========================================
+ Coverage   81.30%   81.33%   +0.03%     
==========================================
  Files        5201     5201              
  Lines      230405   230447      +42     
  Branches    39815    39825      +10     
==========================================
+ Hits       187334   187438     +104     
+ Misses      37328    37263      -65     
- Partials     5743     5746       +3     

Files	Coverage Δ
src/sentry/conf/server.py	88.41% <ø> (ø)
src/sentry/features/__init__.py	100.00% <ø> (ø)
...interfaces/breadcrumbs/breadcrumb/data/default.tsx	37.50% <ø> (ø)
...s/interfaces/breadcrumbs/breadcrumb/data/index.tsx	33.33% <ø> (ø)
...interfaces/breadcrumbs/breadcrumb/data/summary.tsx	87.50% <ø> (ø)
.../components/events/interfaces/spans/spanDetail.tsx	52.99% <ø> (+0.44%)	⬆️
static/app/types/breadcrumbs.tsx	100.00% <ø> (ø)

... and 17 files with indirect coverage changes