Enable frozen string for app/models/**/*.rb

Partially addresses #47424.

app/models/application_setting/term.rb

+# frozen_string_literal: true
+
 class ApplicationSetting
   class Term < ActiveRecord::Base
     include CacheMarkdownField

app/models/badges/group_badge.rb

+# frozen_string_literal: true
+
 class GroupBadge < Badge
   belongs_to :group

app/models/badges/project_badge.rb

+# frozen_string_literal: true
+
 class ProjectBadge < Badge
   belongs_to :project

app/models/blob_viewer/auxiliary.rb

+# frozen_string_literal: true
+
 module BlobViewer
   module Auxiliary
     extend ActiveSupport::Concern

app/models/blob_viewer/balsamiq.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Balsamiq < Base
     include Rich

app/models/blob_viewer/base.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Base
     PARTIAL_PATH_PREFIX = 'projects/blob/viewers'.freeze

app/models/blob_viewer/binary_stl.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class BinarySTL < Base
     include Rich

app/models/blob_viewer/cartfile.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Cartfile < DependencyManager
     include Static

app/models/blob_viewer/changelog.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Changelog < Base
     include Auxiliary

app/models/blob_viewer/client_side.rb

+# frozen_string_literal: true
+
 module BlobViewer
   module ClientSide
     extend ActiveSupport::Concern

app/models/blob_viewer/composer_json.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class ComposerJson < DependencyManager
     include ServerSide

app/models/blob_viewer/contributing.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Contributing < Base
     include Auxiliary

app/models/blob_viewer/dependency_manager.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class DependencyManager < Base
     include Auxiliary

app/models/blob_viewer/download.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Download < Base
     include Simple

app/models/blob_viewer/empty.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Empty < Base
     include Simple

app/models/blob_viewer/gemfile.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Gemfile < DependencyManager
     include Static

app/models/blob_viewer/gemspec.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Gemspec < DependencyManager
     include ServerSide

app/models/blob_viewer/gitlab_ci_yml.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class GitlabCiYml < Base
     include ServerSide

app/models/blob_viewer/godeps_json.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class GodepsJson < DependencyManager
     include Static

app/models/blob_viewer/image.rb

+# frozen_string_literal: true
+
 module BlobViewer
   class Image < Base
     include Rich