Remove old ignore_column from EE code

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

ee/app/models/ee/application_setting.rb

@@ -14,8 +14,6 @@ module EE
 
       belongs_to :file_template_project, class_name: "Project"
 
-      self.ignored_columns += %i[minimum_mirror_sync_time]
-
       validates :shared_runners_minutes,
                 numericality: { greater_than_or_equal_to: 0 }
 

ee/app/models/ee/project.rb

@@ -24,7 +24,6 @@ module EE
       self.ignored_columns += %i[
         mirror_last_update_at
         mirror_last_successful_update_at
-        next_execution_timestamp
       ]
 
       before_save :set_override_pull_mirror_available, unless: -> { ::Gitlab::CurrentSettings.mirror_available }

ee/app/models/ee/project_import_state.rb

@@ -6,8 +6,6 @@ module EE
     extend ::Gitlab::Utils::Override
 
     prepended do
-      self.ignored_columns += %i[created_at updated_at]
-
       BACKOFF_PERIOD = 24.seconds
       JITTER = 6.seconds
 

ee/app/models/ee/user.rb

@@ -18,8 +18,6 @@ module EE
     prepended do
       EMAIL_OPT_IN_SOURCE_ID_GITLAB_COM = 1
 
-      self.ignored_columns += %i[support_bot]
-
       # We aren't using the `auditor?` method for the `if` condition here
       # because `auditor?` returns `false` when the `auditor` column is `true`
       # and the auditor add-on absent. We want to run this validation

ee/app/models/project_repository_state.rb

@@ -3,8 +3,6 @@
 class ProjectRepositoryState < ApplicationRecord
   include ShaAttribute
 
-  self.ignored_columns += %i[last_repository_verification_failed last_wiki_verification_failed]
-
   sha_attribute :repository_verification_checksum
   sha_attribute :wiki_verification_checksum