Drop column repository_read_only column in namespaces tables

changelogs/unreleased/fj-add-repository-read-only-to-groups.yml

----
-title: Add repository_read_only column to the Namespace table
-merge_request: 51800
-author:
-type: added

changelogs/unreleased/revert-3c18ef0b.yml

+---
+title: Drop repository_read_only column from namespaces table
+merge_request: 52181
+author:
+type: changed

db/migrate/20210115084949_add_repository_read_only_to_groups.rb

-# frozen_string_literal: true
-
-class AddRepositoryReadOnlyToGroups < ActiveRecord::Migration[6.0]
-  include Gitlab::Database::MigrationHelpers
-
-  DOWNTIME = false
-
-  def up
-    with_lock_retries do
-      add_column :namespaces, :repository_read_only, :boolean, default: false, null: false
-    end
-  end
-
-  def down
-    with_lock_retries do
-      remove_column :namespaces, :repository_read_only
-    end
-  end
-end

db/migrate/20210121093618_remove_repository_read_only_to_groups.rb

+# frozen_string_literal: true
+
+class RemoveRepositoryReadOnlyToGroups < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    if column_exists?(:namespaces, :repository_read_only)
+      with_lock_retries do
+        remove_column :namespaces, :repository_read_only # rubocop:disable Migration/RemoveColumn
+      end
+    end
+  end
+
+  def down
+    unless column_exists?(:namespaces, :repository_read_only)
+      with_lock_retries do
+        add_column :namespaces, :repository_read_only, :boolean, default: false, null: false
+      end
+    end
+  end
+end

db/schema_migrations/20210115084949

-09766a70e36d4bbd8ecf7f5bba36c865873c1ac71f7eb8de04f70fd2c4da242e
\ No newline at end of file

db/schema_migrations/20210121093618

+e2be30f71b2a4a410b21e57ee53c3b54cf0214a08bc65cd92b2cb4b93bde9451
\ No newline at end of file

db/structure.sql

@@ -14355,8 +14355,7 @@ CREATE TABLE namespaces (
     shared_runners_enabled boolean DEFAULT true NOT NULL,
     allow_descendants_override_disabled_shared_runners boolean DEFAULT false NOT NULL,
     traversal_ids integer[] DEFAULT '{}'::integer[] NOT NULL,
-    delayed_project_removal boolean DEFAULT false NOT NULL,
-    repository_read_only boolean DEFAULT false NOT NULL
+    delayed_project_removal boolean DEFAULT false NOT NULL
 );
 
 CREATE SEQUENCE namespaces_id_seq