Remove redundant implementation of Namespaced

[kornys]

What is the purpose of the change

• Trivial code clean -> remove redundant implementation of Namespaces, since parent class already implements that interface.

Brief change log

(for example:)

• Code clean remove redundant implementation of Namespaced interface

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changes to the CustomResourceDescriptors: (no)
• Core observer or reconciler logic that is regularly executed: (no)

Documentation

• Does this pull request introduce a new feature? (no)

[csviri]

LGTM

[kornys]

closing code is cherry-picked into #1011