Remove unused get_aggregated_coverage QuerySet combinator

[Swatinem]

The only usage of this was within tests, which I am removing in codecov/codecov-api#1262

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.63%. Comparing base (8acbdc6) to head (fdbcb83).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #595   +/-   ##
=======================================
  Coverage   88.62%   88.63%           
=======================================
  Files         463      463           
  Lines       12831    12829    -2     
  Branches     1460     1460           
=======================================
- Hits        11372    11371    -1     
+ Misses       1154     1153    -1     
  Partials      305      305           

Flag	Coverage Δ
shared-docker-uploader	88.63% <ø> (+<0.01%)	⬆️

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[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codspeed-hq]

CodSpeed Performance Report

Merging #595 will not alter performance

_{Comparing swatinem/rm-repomanagerqs (fdbcb83) with main (8acbdc6)}

Summary

✅ 9 untouched benchmarks