Add Rubocop to enforce factories for new tables

Summary

Tables can be added without Factory which in turn can be required for adding specs and seeding the table.

Proposal

Add Rubocop to enforce that new tables can't be added without creating factories for them. Then create a todo list and file issues for teams to add development fixtures for owned tables.

Context: gitlab-org/quality/quality-engineering/team-tasks#1919 (comment 1627260665)