Expand Rails/FindBy (and FindEach) to cover all code locations

[gravitystorm]

Is your feature request related to a problem? Please describe.

I was trying to figure out why rubocop-rails wasn't picking up where(...).first usage in our application (OpenStreetMap).

Eventually I found that the cop is restricted to models only, in the default configuration.

rubocop-rails/config/default.yml

Lines 461 to 469 in 34376e0

	Rails/FindBy:
	Description: 'Prefer find_by over where.first.'
	StyleGuide: 'https://rails.rubystyle.guide#find_by'
	Enabled: true
	VersionAdded: '0.30'
	VersionChanged: '2.11'
	IgnoreWhereFirst: true
	Include:
	- app/models/**/*.rb

However I don't think this restriction is necessary, and I think it's actually unhelpful. I suspect that a large amount, perhaps the majority, of ActiveRecord .where usage would be found in controllers, not in models. In our application, it also crops up repeatedly in our tests.

Describe the solution you'd like

I'd like to see the default configuration updated, to remove the Include: ['app/models/**/*.rb'] restriction, for the Rails/FindBy and Rails/FindEach cops.

Describe alternatives you've considered

The alternative is for everyone to override the configuration for these two cops in their own configuration, e.g.

Rails/FindBy:
  Include:
    - '**/*.rb'

Additional context

The Include restriction was originally introduced alongside the initial cop (in rubocop) in 6188d755eefd94875bc155bbfe433f7752d0bd2b, but I can't find any related discussions.