Add `Style/RedundantFreeze` to remove redudant `.freeze`

Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.

* Exclude these files not to auto correct false positive `Regexp#freeze`
 - 'actionpack/lib/action_dispatch/journey/router/utils.rb'
 - 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'

It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.

* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required

 - 'actionpack/test/controller/test_case_test.rb'
 - 'activemodel/test/cases/type/string_test.rb'
 - 'activesupport/lib/active_support/core_ext/string/strip.rb'
 - 'activesupport/test/core_ext/string_ext_test.rb'
 - 'railties/test/generators/actions_test.rb'

1 files changed, 2 insertions, 2 deletions

diff --git a/actionview/lib/action_view/template/resolver.rb b/actionview/lib/action_view/template/resolver.rb
index 5027303e86..08dd6fb510 100644
--- a/actionview/lib/action_view/template/resolver.rb
+++ b/actionview/lib/action_view/template/resolver.rb
@@ -282,7 +282,7 @@ module ActionView
       end
 
       def escape_entry(entry)
-        entry.gsub(/[*?{}\[\]]/, '\\\\\\&'.freeze)
+        entry.gsub(/[*?{}\[\]]/, '\\\\\\&')
       end
 
       # Returns the file mtime from the filesystem.
@@ -294,7 +294,7 @@ module ActionView
       # from the path, or the handler, we should return the array of formats given
       # to the resolver.
       def extract_handler_and_format_and_variant(path)
-        pieces = File.basename(path).split(".".freeze)
+        pieces = File.basename(path).split(".")
         pieces.shift
 
         extension = pieces.pop