Revert Sentry in implicit usings

[SimonCropp]

• reverts Add Sentry to global usings #1398
• fixes Revert adding Sentry to global usings #1487

[codecov-commenter]

Codecov Report

Merging #1490 (895e8ba) into main (32c7143) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1490      +/-   ##
==========================================
+ Coverage   84.17%   84.23%   +0.05%     
==========================================
  Files         219      219              
  Lines        7383     7383              
  Branches     1420     1420              
==========================================
+ Hits         6215     6219       +4     
+ Misses        732      730       -2     
+ Partials      436      434       -2     

Impacted Files	Coverage Δ
src/Sentry/Internal/BackgroundWorker.cs	94.92% <0.00%> (+2.89%)	⬆️

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