Add abort to the Rails/Exit cop

[adamstegman]

abort is very similar to exit in Ruby (docs), but it takes a string message or Exception. Rails applications should avoid its usage for the same reasons as they avoid exit and exit!. Since they are used in the same way, I thought it belonged in the same cop, but am glad to move it to a new one if that's preferred.

---

Before submitting the PR make sure the following are checked:

• 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.
• If this is a new cop, consider making a corresponding update to the Rails Style Guide.

[koic]

It might be clearer to limit it to methods that are actually used, for example as shown below.
The test code should also be updated accordingly to reflect this change.

diff --git a/lib/rubocop/cop/rails/exit.rb b/lib/rubocop/cop/rails/exit.rb
index fd1901970..5517f1454 100644
--- a/lib/rubocop/cop/rails/exit.rb
+++ b/lib/rubocop/cop/rails/exit.rb
@@ -26,12 +26,16 @@ module RuboCop
       class Exit < Base
         include ConfigurableEnforcedStyle
 
-        MSG = 'Do not use `exit` or `abort` in Rails applications.'
+        MSG = 'Do not use `%<current>s` in Rails applications.'
         RESTRICT_ON_SEND = %i[exit exit! abort].freeze
         EXPLICIT_RECEIVERS = %i[Kernel Process].freeze
 
         def on_send(node)
-          add_offense(node.loc.selector) if offending_node?(node)
+          return unless offending_node?(node)
+
+          message = format(MSG, current: node.method_name)
+
+          add_offense(node.loc.selector, message: message)
         end
 
         private