[FEATURE] Exit with non-zero code if no files formatted/linted

[ziima]

• I've searched the issues
• I've read the docs

Feature Request

I recently discovered djlint stopped linting and checking format of templates in our CI. (I can't reproduce that anywhere else)
The problem I noticed is that djlint complains about checking no files, but it still exits with 0 exit code. That allowed underlying issue to be silently hidden for months.

I suggest djlint to return non-zero exit code if no files were checked, alternatively triggered by an option.

Usecases:

# Should exit with non-zero code, if no HTML files found in `jinja_templates`
djlint --check jinja_templates/
djlint --lint jinja_templates/