Checkout all text files with Unix line-endings

[jandubois]

Right now we specify in .gitattributes:

# All Linux scripts should have LF line endings
# But only text files should be changed (not any binaries / images / etc.)
resources/linux/** text=auto eol=lf
pkg/rancher-desktop/assets/scripts/** text=auto eol=lf

I don't see why we shouldn't do this for all text files instead. This would also simplify our instructions for running BATS on Windows. Alternatively we can just add another rule for bats/**.

May effort here is testing that enabling it globally doesn't break anything.