Clean up some obsolete features

[Swatinem]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.70%. Comparing base (fde7119) to head (d12b084).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #69182      +/-   ##
==========================================
- Coverage   80.01%   79.70%   -0.32%     
==========================================
  Files        6507     6426      -81     
  Lines      290808   285017    -5791     
  Branches    50124    49088    -1036     
==========================================
- Hits       232691   227159    -5532     
+ Misses      57684    57492     -192     
+ Partials      433      366      -67     

Files	Coverage Δ
src/sentry/conf/server.py	89.22% <ø> (-0.21%)	⬇️
src/sentry/features/temporary.py	100.00% <ø> (ø)

... and 1699 files with indirect coverage changes

[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀