Use insta crate for snapshot tests of stacktrace parsing

[Porges]

This makes it easier to regenerate the tests, and also provides nice diffs when things go wrong.

The only changes to current output files is the addition of a header. I've also enabled some more inputs where we already had checked-in outputs but the inputs were currently disabled for some reason.

I noticed some problems in some of the parsed outputs so there are a few bugs to fix in the stacktrace parser.

[codecov-commenter]

Codecov Report

Merging #3027 (ef65ecf) into main (03e5eff) will increase coverage by 0.00%.
The diff coverage is 89.83%.

@@           Coverage Diff           @@
##             main    #3027   +/-   ##
=======================================
  Coverage   29.42%   29.43%           
=======================================
  Files         305      305           
  Lines       36550    36544    -6     
=======================================
  Hits        10755    10755           
+ Misses      25795    25789    -6     

Impacted Files	Coverage Δ
src/agent/stacktrace-parser/src/lib.rs	90.33% <89.83%> (+1.39%)	⬆️

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