Changed ignored_filename_patterns to ignored_path_patterns

[adam-golab]

This PR changes the -i/--ignored-filename-patterns flag to -i/--ignored-path-patterns. As it allows more advanced configuration which files should be ignored.
It works in a similar way like previously, so it accepts a list of directory patterns (regular expressions) to be ignored.
I've encountered difficulties with the previous solution when I wanted to configure the Github Actions for a repository used for GitOps approach. I wasn't able to run validation on all yaml files in any directory with exception of the .github directory.
Now it's possible with passing ignored_path_patterns="^\.github".

[garethr]

Thanks for the submission. I think this is a useful idea, but it's also backwards compatible due to the change in the flag name. If you could add an alias for this for the old command name I'll be happy to merge.

[adam-golab]

Sure @garethr
I've added and pushed the alias a moment ago. Hopefully, that's the correct way to do that