[Rails5] Add `ApplicationRecord`

app/models/abuse_report.rb

-class AbuseReport < ActiveRecord::Base
+class AbuseReport < ApplicationRecord
   include CacheMarkdownField
 
   cache_markdown_field :message, pipeline: :single_line

app/models/appearance.rb

-class Appearance < ActiveRecord::Base
+class Appearance < ApplicationRecord
   include CacheableAttributes
   include CacheMarkdownField
   include ObjectStorage::BackgroundMove

app/models/application_record.rb

+# rubocop:disable  Rails5/ApplicationRecord
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+end

app/models/application_setting.rb

-class ApplicationSetting < ActiveRecord::Base
+class ApplicationSetting < ApplicationRecord
   include CacheableAttributes
   include CacheMarkdownField
   include TokenAuthenticatable

app/models/application_setting/term.rb

 class ApplicationSetting
-  class Term < ActiveRecord::Base
+  class Term < ApplicationRecord
     include CacheMarkdownField
     has_many :term_agreements
 

app/models/audit_event.rb

-class AuditEvent < ActiveRecord::Base
+class AuditEvent < ApplicationRecord
   serialize :details, Hash # rubocop:disable Cop/ActiveRecordSerialize
 
   belongs_to :user, foreign_key: :author_id

app/models/award_emoji.rb

-class AwardEmoji < ActiveRecord::Base
+class AwardEmoji < ApplicationRecord
   DOWNVOTE_NAME = "thumbsdown".freeze
   UPVOTE_NAME   = "thumbsup".freeze
 

app/models/badge.rb

-class Badge < ActiveRecord::Base
+class Badge < ApplicationRecord
   # This structure sets the placeholders that the urls
   # can have. This hash also sets which action to ask when
   # the placeholder is found.

app/models/board.rb

-class Board < ActiveRecord::Base
+class Board < ApplicationRecord
   belongs_to :group
   belongs_to :project
 

app/models/broadcast_message.rb

-class BroadcastMessage < ActiveRecord::Base
+class BroadcastMessage < ApplicationRecord
   include CacheMarkdownField
   include Sortable
 

app/models/chat_name.rb

-class ChatName < ActiveRecord::Base
+class ChatName < ApplicationRecord
   LAST_USED_AT_INTERVAL = 1.hour
 
   belongs_to :service

app/models/chat_team.rb

-class ChatTeam < ActiveRecord::Base
+class ChatTeam < ApplicationRecord
   validates :team_id, presence: true
   validates :namespace, uniqueness: true
 

app/models/ci/build_metadata.rb

 module Ci
   # The purpose of this class is to store Build related data that can be disposed.
   # Data that should be persisted forever, should be stored with Ci::Build model.
-  class BuildMetadata < ActiveRecord::Base
+  class BuildMetadata < ApplicationRecord
     extend Gitlab::Ci::Model
     include Presentable
     include ChronicDurationAttribute

app/models/ci/build_trace_chunk.rb

 module Ci
-  class BuildTraceChunk < ActiveRecord::Base
+  class BuildTraceChunk < ApplicationRecord
     include FastDestroyAll
     extend Gitlab::Ci::Model
 

app/models/ci/build_trace_section.rb

 module Ci
-  class BuildTraceSection < ActiveRecord::Base
+  class BuildTraceSection < ApplicationRecord
     extend Gitlab::Ci::Model
 
     belongs_to :build, class_name: 'Ci::Build'

app/models/ci/build_trace_section_name.rb

 module Ci
-  class BuildTraceSectionName < ActiveRecord::Base
+  class BuildTraceSectionName < ApplicationRecord
     extend Gitlab::Ci::Model
 
     belongs_to :project

app/models/ci/group_variable.rb

 module Ci
-  class GroupVariable < ActiveRecord::Base
+  class GroupVariable < ApplicationRecord
     extend Gitlab::Ci::Model
     include HasVariable
     include Presentable

app/models/ci/job_artifact.rb

 module Ci
-  class JobArtifact < ActiveRecord::Base
+  class JobArtifact < ApplicationRecord
     include AfterCommitQueue
     include ObjectStorage::BackgroundMove
     extend Gitlab::Ci::Model

app/models/ci/pipeline.rb

 module Ci
-  class Pipeline < ActiveRecord::Base
+  class Pipeline < ApplicationRecord
     extend Gitlab::Ci::Model
     include HasStatus
     include Importable

app/models/ci/pipeline_schedule.rb

 module Ci
-  class PipelineSchedule < ActiveRecord::Base
+  class PipelineSchedule < ApplicationRecord
     extend Gitlab::Ci::Model
     include Importable
     include IgnorableColumn