Improve package repository case insensitive error handling

[BryceGattis]

Remake of the original PR #1951 on my personal GitHub.

Closes #1931.

This adds a new unit test for the fix as well.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.11%. Comparing base (0c4b28f) to head (ebbba37).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1974      +/-   ##
==========================================
+ Coverage   60.07%   60.11%   +0.04%     
==========================================
  Files         163      163              
  Lines       20096    20098       +2     
  Branches     3493     3494       +1     
==========================================
+ Hits        12072    12082      +10     
+ Misses       7208     7205       -3     
+ Partials      816      811       -5     

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[BryceGattis]

@JeanChristopheMorinPerso One thing that I could use some help on, from poking around, I expected that adding this new test file would allow me to do rez selftest --package_repository however, I just get:

rez selftest --package_repository
usage: rez [-h] [-i] [-V] [-v] COMMAND ...
rez: error: unrecognized arguments: --package_repository

Looking at selftest, it should be autogenerated as a new flag. Do you have any idea why it's not working?

[JeanChristopheMorinPerso]

@BryceGattis They should appear in rez-selftest if you add a top level docstring if I'm not mistaken.

[BryceGattis]

@BryceGattis They should appear in rez-selftest if you add a top level docstring if I'm not mistaken.

It was due to a typo in the filename 🤦