fix: Logging on body not extracted

[bruno-garcia]

Don't log warning if extracting body data was not opt'ed-in

[codecov-io]

Codecov Report

Merging #246 into master will decrease coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #246     +/-   ##
=========================================
- Coverage   89.28%   89.19%   -0.1%     
=========================================
  Files          81       81             
  Lines        2035     2036      +1     
=========================================
- Hits         1817     1816      -1     
- Misses        218      220      +2

Impacted Files	Coverage Δ
...y/Extensibility/RequestBodyExtractionDispatcher.cs	100% <100%> (ø)	⬆️
src/Sentry/Internal/BackgroundWorker.cs	94.26% <0%> (-1.64%)	⬇️

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