Add request env to rails middleware

[linhmtran168]

Description

• Add request info to sampling context in Rails middleware. Closes Add request info to custom_sampling_context in Rails middleware #1791

[st0012]

@linhmtran168 Thanks for catching this. I actually consider it a bug fix instead of a feature 🙂 Would you mind also adding a changelog entry? Thx

[linhmtran168]

@st0012 I added the changelog entry 😄

[codecov-commenter]

Codecov Report

Merging #1792 (403860f) into master (9f6ab0c) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1792      +/-   ##
==========================================
- Coverage   98.42%   98.41%   -0.01%     
==========================================
  Files         145      145              
  Lines        8559     8576      +17     
==========================================
+ Hits         8424     8440      +16     
- Misses        135      136       +1     

Impacted Files	Coverage Δ
...entry-rails/lib/sentry/rails/capture_exceptions.rb	96.00% <100.00%> (ø)
sentry-rails/spec/sentry/rails/tracing_spec.rb	99.27% <100.00%> (+0.10%)	⬆️
sentry-resque/lib/sentry/resque.rb	97.14% <0.00%> (-2.86%)	⬇️

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[st0012]

@linhmtran168 Thank you 👍