Naming/FileName: make CheckDefinitionPathHierarchy roots configureable

[grosser]

fixes #10220

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

confirmed that it fixes the issue:

parts/monitors/foo/bar.rb:1:1: C: Naming/FileName: bar.rb should define a class or module called Monitors::Foo::Bar. (https://rubystyle.guide#snake-case-files)
module Monitors
^

[grosser]

@dvandersluis could you take a look at this PR plz :)

[dvandersluis]

The cop doc files are generated automatically so should not be included here.

[grosser]

how are they generated ? ... on merge or I have to run something ?

[dvandersluis]

They’re generated as part of the release process.

[dvandersluis]

Can you please rebase? The specs were changed in #10223 (although magically this doesn't seem to have added a conflict somehow!)

Also, please add tests for CheckDefinitionPathHierarchyRoots specifically.

[grosser]

both the "file is under roots" and "file is not under roots" cases are already covered and the test uses the new configuration option ... but added a new test anyway
removed the doc addition

[grosser]

good to go ?

[dvandersluis]

Thanks @grosser !