Fix interpolated wall velocity with cut_off_bnd=false

[efaulhaber]

I fixed this before somewhere, but I forgot where and can't find it anymore. Maybe in one of my old fin prototyping branches?

[Copilot]

Pull request overview

This PR addresses incorrect interpolation of boundary wall velocity when include_wall_velocity=true is used together with cut_off_bnd=false, ensuring boundary contributions are considered even when the cutoff logic is disabled.

Changes:

• Update interpolation system iteration logic to include boundary systems when include_wall_velocity=true, even if cut_off_bnd=false.
• Add 2D and 3D regression tests for include_wall_velocity=true with cut_off_bnd=false at the wall point.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/general/interpolation.jl	Adjusts which systems are iterated during interpolation to include boundary systems when wall velocity is requested.
test/general/interpolation.jl	Adds regression assertions for interpolated wall velocity with cut_off_bnd=false in both 2D and 3D testsets.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.52%. Comparing base (7e43937) to head (70c9408).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1185   +/-   ##
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  Coverage   70.51%   70.52%           
=======================================
  Files         132      132           
  Lines       10413    10414    +1     
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+ Hits         7343     7344    +1     
  Misses       3070     3070           

Flag	Coverage Δ
unit	70.52% <100.00%> (+<0.01%)	⬆️

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