WIP 6.0 major

[sl0thentr0py]

• Drop async configuration #1894
• Migrate from to_hash to to_h #2351
• Add before_send_check_in #2703
• Archive sentry-raven #2708

[github-actions]

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## Unreleased

- WIP 6.0 major ([#2352](https://github.com/getsentry/sentry-ruby/pull/2352))

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Generated by 🚫 dangerJS against ebe5268

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.43%. Comparing base (1da1c2d) to head (ebe5268).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2352      +/-   ##
==========================================
+ Coverage   97.31%   97.43%   +0.12%     
==========================================
  Files         144      143       -1     
  Lines        5652     5612      -40     
==========================================
- Hits         5500     5468      -32     
+ Misses        152      144       -8     

Components	Coverage Δ
sentry-ruby	97.72% <100.00%> (-0.06%)	⬇️
sentry-rails	96.59% <100.00%> (+0.97%)	⬆️
sentry-sidekiq	96.57% <ø> (ø)
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	99.31% <ø> (ø)

Files with missing lines	Coverage Δ
sentry-rails/lib/sentry/rails/active_job.rb	98.46% <100.00%> (+1.40%)	⬆️
...s/lib/sentry/rails/overrides/streaming_reporter.rb	71.42% <ø> (+9.89%)	⬆️
sentry-ruby/lib/sentry/background_worker.rb	97.43% <100.00%> (-0.19%)	⬇️
sentry-ruby/lib/sentry/breadcrumb.rb	93.93% <100.00%> (ø)
sentry-ruby/lib/sentry/breadcrumb_buffer.rb	96.42% <100.00%> (ø)
sentry-ruby/lib/sentry/check_in_event.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/client.rb	99.36% <100.00%> (-0.05%)	⬇️
sentry-ruby/lib/sentry/configuration.rb	98.40% <100.00%> (ø)
sentry-ruby/lib/sentry/cron/monitor_config.rb	95.45% <100.00%> (ø)
sentry-ruby/lib/sentry/cron/monitor_schedule.rb	100.00% <100.00%> (ø)
... and 18 more

... and 2 files with indirect coverage changes

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