Drop Clusters::Applications related tables

We're cleaning up the deprecated Clusters::Applications code related to Remove clusters_applications_* code (#366573 - closed)

In Clusters::Applications models removal (#388696 - closed) we removed the related models.

In !117460 (merged) we dropped the foreign keys. This was in post deploy migration that was merged.

Now that the models have been removed, we want to clean up the database.

This MR's purpose is to

• drop the related tables in a post deployment migration
• move the dictionary files per these instructions