Example project.ruleset.xml: improve exclusion pattern suggestions
Example project.ruleset.xml: improve exclusion pattern suggestions

* Add exclusion of minified JS files.
* Add exclusion of Node modules directory
* Remove exclusion of `*.twig` files as that's not an extension that is included by PHPCS by default, so would need to be added via `--extensions=...` for those files to be picked up in the first place.

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