Use DebugDiagnosticLogger as the default logger for legacy ASP.NET

[Tyrrrz]

Closes #971

[codecov-commenter]

Codecov Report

Merging #1012 (97fcbfd) into main (796890b) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1012      +/-   ##
==========================================
+ Coverage   81.24%   81.26%   +0.02%     
==========================================
  Files         184      184              
  Lines        5907     5908       +1     
  Branches     1456     1457       +1     
==========================================
+ Hits         4799     4801       +2     
+ Misses        691      690       -1     
  Partials      417      417              

Impacted Files	Coverage Δ
src/Sentry.AspNet/SentryAspNetOptionsExtensions.cs	90.00% <100.00%> (+1.11%)	⬆️
src/Sentry/Infrastructure/DebugDiagnosticLogger.cs	50.00% <0.00%> (+50.00%)	⬆️

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