Include path for Fusion subgraph errors

[tobias-tengler]

Fixes #6917

[tobias-tengler]

@michaelstaib I'd like some feedback on how I should best approach fixing this. I was thinking of including the errors returned from a subgraph on the ExecutionState. In the compose queryplan node I'd then check if there is an error associated with what I'm composing into the final result. I checked and I should have everything available to use the PathHelper.CreatePathFromContext to create a path that corresponds to the final result.
Do you already see a reason why that wouldn't work or why it's conceptually wrong? I'm still in the process of exploring how Fusion actually works...

[github-actions]

Qodana for .NET

9 new problems were found

Inspection name	Severity	Problems
Redundant nullable warning suppression expression	🔶 Warning	9

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[codecov]

Codecov Report

Attention: Patch coverage is 88.57143% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 70.14%. Comparing base (ed0449f) to head (2387595).

Files	Patch %	Lines
...ocolate/Fusion/src/Core/Execution/ExecutorUtils.cs	66.66%	2 Missing ⚠️
...sion/src/Core/Execution/Nodes/ResolveByKeyBatch.cs	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6916      +/-   ##
==========================================
- Coverage   72.80%   70.14%   -2.66%     
==========================================
  Files        2590     2590              
  Lines      129386   129386              
==========================================
- Hits        94194    90759    -3435     
- Misses      35192    38627    +3435     

Flag	Coverage Δ
unittests	70.14% <88.57%> (-2.66%)	⬇️

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