Fix incorrect sdk name in envelope header

[SimonCropp]

fixes #1219

Sentry.Reflection.AssemblyExtensions is also obsoleted.

[codecov-commenter]

Codecov Report

Merging #1474 (d6444db) into main (8b4d317) will decrease coverage by 0.00%.
The diff coverage is 95.45%.

❗ Current head d6444db differs from pull request most recent head 63bbd9d. Consider uploading reports for the commit 63bbd9d to get more accurate results

@@            Coverage Diff             @@
##             main    #1474      +/-   ##
==========================================
- Coverage   84.23%   84.22%   -0.01%     
==========================================
  Files         219      219              
  Lines        7383     7392       +9     
  Branches     1415     1416       +1     
==========================================
+ Hits         6219     6226       +7     
  Misses        728      728              
- Partials      436      438       +2     

Impacted Files	Coverage Δ
src/Sentry/Reflection/AssemblyExtensions.cs	76.92% <88.88%> (+10.25%)	⬆️
src/Sentry/Internal/ApplicationVersionLocator.cs	81.81% <100.00%> (+1.81%)	⬆️
src/Sentry/Internal/MainSentryEventProcessor.cs	97.34% <100.00%> (ø)
src/Sentry/SdkVersion.cs	100.00% <100.00%> (ø)
src/Sentry/Internal/MonoSentryStackTraceFactory.cs	92.59% <0.00%> (-3.71%)	⬇️
src/Sentry/Internal/BackgroundWorker.cs	91.30% <0.00%> (-0.73%)	⬇️

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