Work around RubyMine usability/productivity problems related to RuboCop Gitlab/NamespacedClass cop

What does this MR do and why?

This MR is related to the remaining unfixed Gitlab/NamespacedClass cop warnings and their interaction with the REVEAL_RUBOCOP_TODO functionality you added in !53162 (diffs)

In the RubyMine IDE, there's no way to selectively disable individual cops for the RuboCop plugin, which results in every single model and lib class having every line of the entire file underlined as an error.

This is not only hard to read, it masks all other warnings and errors within the class. Example:

Example of visual usability problems and masked warnings:

How to set up and validate locally

Open lib/gitlab/fips.rb in RubyMine, see that the visual problems no longer exist.

MR acceptance checklist

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