Parse .NET exception stacks in crash output

[Porges]

Closes #538.

Attempt to parse out .NET exception stack traces when we see them in crash log output.

1. Summaries: when we detect a .NET stack trace in the output (given by lines starting with the literal string " at "), locate the exception messages and use them as the summary.
2. Call stacks: also add the .NET stack frames (for the outer exception only) to the "top" of the call stack. This means we generate a call stack that is not entirely true, since there is additional ASAN stuff in between which is not really on the stack at the time the exception was generated, but it should still be more useful (and help with crash de-duplication).
   • A proper fix here might be that we allow multiple stack traces to be added to a crash report; this way the .NET trace would be distinct from the native/ASAN one (and we could then also provide the inner .NET stack traces as well).
3. I found that there is some additional information that can be present in ASAN crash output (BuildId) which was breaking the ASAN parsing code. I've extended it to fix this and added a few test cases.
4. If input tester failed due to not finding the executable, no good message was printed. I've improved this slightly, but not much.

[codecov-commenter]

Codecov Report

Merging #2988 (00f312c) into main (2b1f400) will increase coverage by 0.27%.
The diff coverage is 83.65%.

@@            Coverage Diff             @@
##             main    #2988      +/-   ##
==========================================
+ Coverage   29.10%   29.37%   +0.27%     
==========================================
  Files         304      305       +1     
  Lines       36343    36489     +146     
==========================================
+ Hits        10576    10720     +144     
- Misses      25767    25769       +2     

Impacted Files	Coverage Δ
src/agent/onefuzz/src/input_tester.rs	0.00% <0.00%> (ø)
src/agent/onefuzz/src/libfuzzer.rs	71.65% <0.00%> (-0.08%)	⬇️
src/agent/stacktrace-parser/src/asan.rs	100.00% <100.00%> (+0.44%)	⬆️
src/agent/stacktrace-parser/src/dotnet.rs	100.00% <100.00%> (ø)
src/agent/stacktrace-parser/src/lib.rs	88.94% <100.00%> (+0.29%)	⬆️

... and 17 files with indirect coverage changes

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