Update CONTRIBUTING.md Regarding Validate filenames Fail

[kangaroo-eating-carrots]

Feature description

I believe it will be helpful if a solution is updated regarding the test failure of Validate files names which the project participants who are using Windows may experience when trying to commit.

There was an issue regarding this problem (#8736), I easily fixed it with the comment from jlhuhn (using 'mklink' command).

I appreciated his comment, but it believe it will be much better if the solution is added to CONTRIBUTING.md in 'Pre-commit plugin' section as participants can notice this problem after using 'pre-commit run --all-files --show-diff-on-failure'.

Thank you.

[edlerd]

I will send a PR for this shortly.

[kangaroo-eating-carrots]

This issue is resolved by #12371