[Fix #1058] Relax Include path for Rails/FindBy and Rails/FindEach

Fixes #1058.

This PR relaxes `Include` path for `Rails/FindBy` and `Rails/FindEach`.

`Rails/FindBy` was introduced in rubocop/rubocop@6188d75.
This was before it was extracted to RuboCop Rails, which is probably why it was
targeting `app/models`. So, RuboCop Rails targeting Rails would not need it.

`Rails/FindEach` is the same:
rubocop/rubocop@f2e26812

Author: koic

changelog/change_relax_include_path_for_rails_find_by_and_find_each.md

@@ -0,0 +1 @@
+* [#1058](https://github.com/rubocop/rubocop-rails/issues/1058): Relax `Include` path for `Rails/FindBy` and `Rails/FindEach`. ([@koic][])

config/default.yml

@@ -463,10 +463,8 @@ Rails/FindBy:
   StyleGuide: 'https://rails.rubystyle.guide#find_by'
   Enabled: true
   VersionAdded: '0.30'
-  VersionChanged: '2.11'
+  VersionChanged: '<<next>>'
   IgnoreWhereFirst: true
-  Include:
-    - app/models/**/*.rb
 
 Rails/FindById:
   Description: >-
@@ -482,9 +480,7 @@ Rails/FindEach:
   Enabled: true
   Safe: false
   VersionAdded: '0.30'
-  VersionChanged: '2.19'
-  Include:
-    - app/models/**/*.rb
+  VersionChanged: '<<next>>'
   AllowedMethods:
     # Methods that don't work well with `find_each`.
     - order