chore: Drop even more deprecated stuff

[sentrivana]

Drop:

• setting Scope.transaction directly
• old way of setting failed_request_status_codes
• setting the span argument of Scope.trace_propagation_meta
• setting Scope.user directly

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.52%. Comparing base (bff8fdd) to head (e3da71f).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
sentry_sdk/integrations/django/__init__.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           potel-base    #4193      +/-   ##
==============================================
+ Coverage       83.47%   83.52%   +0.05%     
==============================================
  Files             143      143              
  Lines           14678    14596      -82     
  Branches         2332     2310      -22     
==============================================
- Hits            12252    12192      -60     
+ Misses           1709     1686      -23     
- Partials          717      718       +1     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/_wsgi_common.py	82.45% <100.00%> (-0.75%)	⬇️
sentry_sdk/integrations/starlette.py	84.68% <100.00%> (-0.27%)	⬇️
sentry_sdk/scope.py	82.40% <ø> (+0.58%)	⬆️
sentry_sdk/integrations/django/__init__.py	83.19% <0.00%> (-0.46%)	⬇️

... and 3 files with indirect coverage changes