Fix various mypy errors in archinstall/lib/

[correctmost]

PR Description:

This PR fixes various mypy errors in archinstall/lib/. The remaining errors are more complex and can be handled separately.

Tests and Checks

• I have tested the code!
  

[svartkanin]

@correctmost do you mind adding any files/directories that are fully fixed to the mypy.ini file as includes, that way they are ensured to remain clean as the check is run on PRs

[correctmost]

@correctmost do you mind adding any files/directories that are fully fixed to the mypy.ini file as includes, that way they are ensured to remain clean as the check is run on PRs

I have an upcoming PR that will expand the mypy checks in pyproject.toml. I'm hoping it will be possible to remove mypy.ini soon.

Thanks for the reviews!

[svartkanin]

@correctmost the mypy.ini that currently exists is an addition to the config in the toml as it's basically strictly checking everything. Not sure the toml can be removed or replaced before all files are compliant with the strict validation

[Torxed]

I think we'll need it until the entire project is compliant.
Which might take a while, but we really appreciate the contributions to get close to that goal.
It will speed up error checks a lot once the coverage is complete.

[correctmost]

I think I found a good way to centralize the mypy configs and increase strictness: #2651

This will allow us to gradually roll out more strict checks over the entire codebase without dealing with multiple config files.