Discourage use of Current.organization outside of approved app layers

Description of the proposal

Discourage use of Current.organization outside of approved app layers

• add rubocop to lint on use of Current.organization outside of approved app layers.
• see #442751 (closed) for details

      # # bad
      # class SomeService
      #   def execute
      #     do_something_with(Current.organization)
      #   end
      # end
      #
      # # good
      # class SomeController < ApplicationController
      #   def create
      #     response = SomeService.new(organization: Current.organization).execute
      #   end
      # end
      #
      # class SomeService
      #   def initialize(organization:)
      #     @organization = organization
      #   end
      #
      #   def execute
      #     do_something_with(@organization)
      #   end
      # end

Check-list

• Mention this proposal in the relevant Slack channels (e.g. #development, #backend, #frontend)
  • handled by discussion in the related issue
• The MR doesn't have significant objections, and is getting a majority of 👍 vs 👎 (remember that we don't need to reach a consensus)
• Follow the review process as usual

Related to #442751 (closed)