Merge branch '44306-drop-jquery-rails' into 'master'

Drop jquery-rails gem from Gemfile

Closes #44306

See merge request gitlab-org/gitlab-ce!17771

Gemfile

@@ -257,7 +257,6 @@ gem 'font-awesome-rails', '~> 4.7'
 gem 'gemojione', '~> 3.3'
 gem 'gon', '~> 6.1.0'
 gem 'jquery-atwho-rails', '~> 1.3.2'
-gem 'jquery-rails', '~> 4.3.1'
 gem 'request_store', '~> 1.3'
 gem 'select2-rails', '~> 3.5.9'
 gem 'virtus', '~> 1.0.1'

Gemfile.lock

@@ -426,10 +426,6 @@ GEM
       multipart-post
       oauth (~> 0.5, >= 0.5.0)
     jquery-atwho-rails (1.3.2)
-    jquery-rails (4.3.1)
-      rails-dom-testing (>= 1, < 3)
-      railties (>= 4.2.0)
-      thor (>= 0.14, < 2.0)
     json (1.8.6)
     json-jwt (1.7.2)
       activesupport
@@ -1089,7 +1085,6 @@ DEPENDENCIES
   influxdb (~> 0.2)
   jira-ruby (~> 1.4)
   jquery-atwho-rails (~> 1.3.2)
-  jquery-rails (~> 4.3.1)
   json-schema (~> 2.8.0)
   jwt (~> 1.5.6)
   kaminari (~> 1.0)