[do not merge] Remove databag trimming

[sentrivana]

• remove databag breadth/depth trimming completely
• remove associated serializer args (remaining_depth, remaining_breadth)
• set max_request_body_size to "always" by default

About the do-not-merge: We want to dogfood this separately, after we're confident the other SDK changes are ok.

Ref #4172

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.93%. Comparing base (146f101) to head (59ee530).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff               @@
##           potel-base    #4645      +/-   ##
==============================================
- Coverage       84.99%   84.93%   -0.07%     
==============================================
  Files             158      158              
  Lines           15519    15495      -24     
  Branches         2456     2447       -9     
==============================================
- Hits            13191    13160      -31     
- Misses           1573     1580       +7     
  Partials          755      755              

Files with missing lines	Coverage Δ
sentry_sdk/client.py	84.88% <ø> (ø)
sentry_sdk/consts.py	99.67% <ø> (ø)
sentry_sdk/integrations/pure_eval.py	70.27% <100.00%> (ø)
sentry_sdk/serializer.py	100.00% <100.00%> (+2.24%)	⬆️

... and 4 files with indirect coverage changes