fix(django): Don't let RawPostDataException bubble up

[sentrivana]

Django might raise a RawPostDataException when we attempt to read the body to include it in the event. We don't know what triggers this (something something DRF probably), but whatever the reason is, we shouldn't error out.

Fixes #3045
Fixes #3539

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.54%. Comparing base (ed614c0) to head (1c1a4b0).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3553      +/-   ##
==========================================
+ Coverage   84.49%   84.54%   +0.05%     
==========================================
  Files         133      133              
  Lines       13837    13840       +3     
  Branches     2927     2927              
==========================================
+ Hits        11691    11701      +10     
+ Misses       1420     1415       -5     
+ Partials      726      724       -2     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/_wsgi_common.py	85.58% <100.00%> (+1.32%)	⬆️

... and 4 files with indirect coverage changes