Introduce SkipLastWhile extension

[ArmoryNode]

Adds SkipLastWhile extension method and associated tests

Closes #1036

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.30%. Comparing base (72c3c66) to head (8a6ac3d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1085      +/-   ##
==========================================
+ Coverage   93.22%   93.30%   +0.07%     
==========================================
  Files         112      113       +1     
  Lines        3410     3448      +38     
  Branches      962      971       +9     
==========================================
+ Hits         3179     3217      +38     
  Misses        215      215              
  Partials       16       16              

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[atifaziz]

This is a really good quality PR. Thanks for picking up #1085 and taking the trouble to conform to the project's conventions.

I've left a few comments & suggestion from my initial review.

[atifaziz]

Thanks for sharing your findings.

I have done a second review pass and submitted some suggestions and comments.

I reckon we need one final pass and then we can get this in! 🏁

---

PS Run build.cmd or build.sh locally to update the generated extensions since the CI checks/runs are failing due to stale code.

[atifaziz]

Apart from the comments I've left, this needs merging with the base since .NET 9 has been added as a new target and the public API will need entries for this new extension. After that, I think we're good to merge. Thanks!

[atifaziz]

Thanks for your patience, all the follow-up and contributing this in the first place.