fix: Keep events in case of nonserializable context

[bitsandfoxes]

No description provided.

[bruno-garcia]

Turns out the serializes does push data into the writer before it fails. So it can end up at a broken state when we handle the exception. Added some compensating code there to fix the JSON and some extra logging.

[bruno-garcia]

Turns out what exception is thrown changed from netcore 2.1 and other targets.

[codecov-commenter]

Codecov Report

Merging #1401 (4e7168b) into main (878bba7) will decrease coverage by 0.28%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #1401      +/-   ##
==========================================
- Coverage   83.01%   82.72%   -0.29%     
==========================================
  Files         217      217              
  Lines        7295     7306      +11     
  Branches     1411     1415       +4     
==========================================
- Hits         6056     6044      -12     
- Misses        804      831      +27     
+ Partials      435      431       -4     

Impacted Files	Coverage Δ
src/Sentry/Envelopes/EnvelopeItem.cs	93.07% <ø> (ø)
src/Sentry/Internal/Http/EnvelopeHttpContent.cs	75.00% <50.00%> (-25.00%)	⬇️
src/Sentry/Internal/Extensions/JsonExtensions.cs	84.04% <77.77%> (+5.70%)	⬆️
src/Sentry/PlatformAbstractions/FrameworkInfo.cs	0.00% <0.00%> (-100.00%)	⬇️
...ntry/PlatformAbstractions/RegistryKeyExtensions.cs	0.00% <0.00%> (-100.00%)	⬇️
...Sentry/PlatformAbstractions/FrameworkInfo.NetFx.cs	0.00% <0.00%> (-70.43%)	⬇️
...rmAbstractions/NetFxInstallationsEventProcessor.cs	4.54% <0.00%> (-68.19%)	⬇️
...ntry/PlatformAbstractions/FrameworkInstallation.cs	25.00% <0.00%> (-37.50%)	⬇️
...ntry/Integrations/NetFxInstallationsIntegration.cs	28.57% <0.00%> (-28.58%)	⬇️
src/Sentry/PlatformAbstractions/RuntimeInfo.cs	53.44% <0.00%> (-5.18%)	⬇️
... and 15 more

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