Enable backpressure handling by default

[jamescrosswell]

Resolves #4494

• Enable automatic backpressure handling by default #4494

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (version6@c32dfbb). Learn more about missing BASE report.

Additional details and impacted files

@@             Coverage Diff             @@
##             version6    #4615   +/-   ##
===========================================
  Coverage            ?   72.58%           
===========================================
  Files               ?      464           
  Lines               ?    16984           
  Branches            ?     3342           
===========================================
  Hits                ?    12327           
  Misses              ?     3811           
  Partials            ?      846           

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[github-actions]

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## Unreleased

- Enable backpressure handling by default ([#4615](https://github.com/getsentry/sentry-dotnet/pull/4615))

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