fix: check crash callback for sessions

[bruno-garcia]

Instead of assuming a previous session was healthy if it was on the background. First check with the optional callback used for native integrations.

In order to debug this I had to adjust some of the debug logs. In the process I fix their format inconsistencies.

[codecov-commenter]

Codecov Report

Merging #1222 (388d2f3) into main (2cf2d02) will increase coverage by 0.13%.
The diff coverage is 58.82%.

@@ Coverage Diff @@## main #1222 +/- ##
==========================================
+ Coverage 80.45% 80.59% +0.13% 
==========================================
Files 212 212 Lines 6924 6904 -20 Branches 1587 1587 ==========================================
- Hits 5571 5564 -7 + Misses 824 809 -15 - Partials 529 531 +2 

Impacted Files	Coverage Δ
src/Sentry/Internal/Hub.cs	69.84% <0.00%> (+3.50%)	⬆️
src/Sentry/GlobalSessionManager.cs	70.04% <68.00%> (+0.17%)	⬆️
...ry/Integrations/AppDomainProcessExitIntegration.cs	84.61% <75.00%> (-6.30%)	⬇️

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