Catalog rename (#2003)

* catalog: CNF Certification rename to Red Hat Best Practices for Kubernetes

The references to "CNF Certification" or "CNF Certification Suite" have been
changed to "Red Hat Best Practices Test Suite for Kubernetes" or a simplified
version of this name, such as "Test Suite", when the meaning is clear from
the context.

Also, to broaden the scope of the potential targets of the Test Suite the word
"CNF" has been replaced for "workload" where applicable.

* Fix linting errors

* Rewording a sentence