Fixes Invoke-Parallel not disposing Runspaces

[santisq]

This PR fixes the issue where the cmdlet would not be correctly disposing runspaces in scenarios where a PipelineStoppedException was thrown (CTRL+C / Select-Object -First) and OperationCanceledException (Timeout reached).

[codecov]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.16%. Comparing base (8fe77ca) to head (0edd1a7).

❗ Current head 0edd1a7 differs from pull request most recent head 8b3cfb4

Please upload reports for the commit 8b3cfb4 to get more accurate results.

Files	Patch %	Lines
src/PSParallelPipeline/RunspacePool.cs	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
- Coverage   92.27%   92.16%   -0.12%     
==========================================
  Files          10       10              
  Lines         531      536       +5     
  Branches       38       39       +1     
==========================================
+ Hits          490      494       +4     
  Misses         33       33              
- Partials        8        9       +1     

Flag	Coverage Δ
PS-5.1	88.51% <94.44%> (-3.29%)	⬇️
PS-7_Linux	91.79% <94.44%> (-0.49%)	⬇️
PS-7_Windows	92.11% <94.44%> (-0.14%)	⬇️

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