Move EE code out of Gitlab::GitAccess

This moves EE specific code out of Gitlab::GitAccess and into
EE::Gitlab::GitAccess. This commit also removes a few redundant comments
that were not present in CE.

ee/lib/ee/gitlab/git_access.rb

@@ -5,6 +5,8 @@ module EE
     module GitAccess
       prepend GeoGitAccess
       extend ::Gitlab::Utils::Override
+      include ActionView::Helpers::SanitizeHelper
+      include PathLocksHelper
 
       override :check
       def check(cmd, changes)

lib/gitlab/git_access.rb

@@ -4,9 +4,6 @@
 # class return an instance of `GitlabAccessStatus`
 module Gitlab
   class GitAccess
-    prepend ::EE::Gitlab::GitAccess # rubocop: disable Cop/InjectEnterpriseEditionModule
-    include ActionView::Helpers::SanitizeHelper
-    include PathLocksHelper
     include Gitlab::Utils::StrongMemoize
 
     UnauthorizedError = Class.new(StandardError)
@@ -249,22 +246,18 @@ module Gitlab
       end
     end
 
-    # TODO: please clean this up
     def check_push_access!
       if project.repository_read_only?
-        # The repository is temporarily read-only. Please try again later.
         raise UnauthorizedError, ERROR_MESSAGES[:read_only]
       end
 
       if deploy_key?
         unless deploy_key.can_push_to?(project)
-          # This deploy key does not have write access to this project.
           raise UnauthorizedError, ERROR_MESSAGES[:deploy_key_upload]
         end
       elsif user
         # User access is verified in check_change_access!
       else
-        # You are not allowed to upload code for this project.
         raise UnauthorizedError, ERROR_MESSAGES[:upload]
       end
 
@@ -407,3 +400,5 @@ module Gitlab
     end
   end
 end
+
+Gitlab::GitAccess.prepend(EE::Gitlab::GitAccess)