feat: add remaining tests for alias

[AlessandroMiola]

Summary:

• e45bbfc, b7396e0, 493c0fd: attempts to further investigate the not working behaviour when referencing just commands in .pre-commit-config.yaml. I'm still not able to correctly interpret the answer from https://stackoverflow.com/questions/78243419/just-error-justfile-does-not-contain-recipes-when-pre-committing, nor any other solution I've tried does work; revert to using "unrolled" poetry run commands in .pre-commit-config.yaml¹
• 3c2d72f:
  • tests/aliasing/conftest.py: add fixtures to deal with AliasGenerator and alias_priority configs
  • tests/aliasing/test_combination_aliases.py: test AliasGenerator and alias_priority combinations
• 9ba22fb:
  • tests/aliasing/conftest.py: add fixtures to deal with AliasChoices and AliasPath
  • tests/aliasing/test_validation_alias.py: test validation with AliasChoices and AliasPath

Footnotes

1. must not be an issue solely pertaining to just though, but rather to referencing just commands in .pre-commit-config.yaml. Indeed, the same commands do work smoothly in .github/workflows/actions.yaml ↩