Validate not null constraint on projects.project_namespace_id column

Changelog: other

db/post_migrate/20250122141254_prepare_project_namespace_id_not_null_validation.rb

+# frozen_string_literal: true
+
+class PrepareProjectNamespaceIdNotNullValidation < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+
+  CONSTRAINT_NAME = 'check_fa75869cb1'
+
+  def up
+    prepare_async_check_constraint_validation :projects, name: CONSTRAINT_NAME
+  end
+
+  def down
+    unprepare_async_check_constraint_validation :projects, name: CONSTRAINT_NAME
+  end
+end

db/schema_migrations/20250122141254

+611a66c80598f6121cf50b516b41a7b4bf432b001eab05afe4b1489f2ef6dd97
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