Updated to use maxsplit=1

[maitrey]

Changelog: Fix: Fix Git is_dirty detection of excluded files with paths.
Docs: Omit

I have a file that has a space in its name. In the conan export method I use it like this:

def export(self):
        git = Git(self, self.recipe_folder, excluded=["src/file Component Toolchain.prj"])
        git.coordinates_to_conandata()

and this fails because of the split:

lines = [line.split()[1] for line in lines if line]

Closes #17570

• Refer to the issue that supports this Pull Request. [question] Files with space in name fails when creating an object of Git with excluded list #17570
• If the issue has missing info, explain the purpose/use case/pain/need that covers this Pull Request.
• I've read the Contributing guide.
• I've followed the PEP8 style guides for Python code.
• I've opened another PR in the Conan docs repo to the develop branch, documenting this one.

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