remove session_totals field from report json

[matt-codecov]

https://github.com/codecov/internal-issues/issues/515
codecov/shared#329

this field is bugged and, as far as i can tell, unused. see ticket + shared PR for details

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Codecov Report

All modified and coverable lines are covered by tests ✅

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.16%. Comparing base (9aa6458) to head (c19cc8a).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##               main       #752   +/-   ##
===========================================
  Coverage   96.16000   96.16000           
===========================================
  Files           814        814           
  Lines         18423      18423           
===========================================
  Hits          17716      17716           
  Misses          707        707           

Flag	Coverage Δ
unit	91.91% <ø> (ø)
unit-latest-uploader	91.91% <ø> (ø)

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[Swatinem]

always happy to see code go.
I guess the only real change here is in services/report.py which seems trivial?