Don't include headers & request info in tracing span or breadcrumb

[st0012]

Data like request or headers can be huge in some applications. They're also likely to contain complex data structure that's hard/impossible to serialize (some might cause infinite loop).

Consider those information should have been collected in the request interface of the event, storing them in breadcrumbs could cause more harm than benefit.

[codecov-io]

Codecov Report

Merging #1199 (8acb142) into master (f701932) will increase coverage by 0.91%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1199      +/-   ##
==========================================
+ Coverage   97.99%   98.90%   +0.91%     
==========================================
  Files         192       28     -164     
  Lines        8181      733    -7448     
==========================================
- Hits         8017      725    -7292     
+ Misses        164        8     -156     

Impacted Files	Coverage Δ
...b/sentry/rails/breadcrumb/active_support_logger.rb	100.00% <100.00%> (ø)
...ntry/rails/tracing/action_controller_subscriber.rb	100.00% <100.00%> (ø)
...ec/sentry/rails/active_support_breadcrumbs_spec.rb	100.00% <100.00%> (ø)
...rails/tracing/action_controller_subscriber_spec.rb	100.00% <100.00%> (ø)
.../lib/raven/integrations/rails/backtrace_cleaner.rb
sentry-raven/lib/raven/interfaces/message.rb
sentry-ruby/spec/sentry/event_spec.rb
sentry-ruby/spec/sentry/transaction_spec.rb
sentry-raven/spec/raven/transports/http_spec.rb
...s/rails/overrides/debug_exceptions_catcher_spec.rb
... and 158 more

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[leonid-shevtsov]

This is not enough, you need to also remove response - in particular because it contains a reference to request - and many other nasty objects too.

[st0012]

@leonid-shevtsov I'm sorry that I missed this comment 🙇 I've added #1463 to fix the issue.