Move Sentry::Rails::CaptureExceptions before ActionDispatch::ShowExceptions

[st0012]

This can save us from reporting the exception manually in RescuedExceptionInterceptor, which was designed to prevent the exception being rescued by ShowExceptions.

[codecov-commenter]

Codecov Report

Merging #1608 (032e995) into master (81c0f81) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1608      +/-   ##
==========================================
- Coverage   98.45%   98.43%   -0.02%     
==========================================
  Files         130      130              
  Lines        7230     7221       -9     
==========================================
- Hits         7118     7108      -10     
- Misses        112      113       +1     

Impacted Files	Coverage Δ
.../lib/sentry/rails/rescued_exception_interceptor.rb	85.71% <ø> (-5.60%)	⬇️
sentry-rails/lib/sentry/rails/railtie.rb	100.00% <100.00%> (ø)
sentry-rails/spec/sentry/rails_spec.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/breadcrumb.rb	95.65% <0.00%> (-4.35%)	⬇️

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