Powershell alias return correct exit codes

[brycegbrazen]

Fixes issue where powershell plugins were not correctly capturing exit codes when aliased commands failed.

Closes #1776.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.40%. Comparing base (a13f7bb) to head (3a90505).
Report is 55 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1778      +/-   ##
==========================================
- Coverage   58.41%   58.40%   -0.01%     
==========================================
  Files         126      126              
  Lines       17163    17165       +2     
  Branches     3506     3506              
==========================================
+ Hits        10025    10026       +1     
- Misses       6473     6474       +1     
  Partials      665      665              

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[brycegbrazen]

Looks like Python isn't installed to all of our action VMs? Not sure what other command I could use that's shell agnostic outside of echo. I don't think there's a way to make echo fail as I need this test to.

[JeanChristopheMorinPerso]

@brycegbrazen these tests are complex, so reuse what's already there and don't call python directly. Look at the test_command test. It uses a pre-configured hello_world command that I think can be instructed to exit with a specific exit code.

[JeanChristopheMorinPerso]

https://github.com/AcademySoftwareFoundation/rez/blob/main/src%2Frez%2Fbind%2Fhello_world.py#L34