Rename user table from auth_user to users_user

[rhysyngsun]

NOTE: #2015 should be reviewed first

What are the relevant tickets?

Part of https://github.com/mitodl/hq/issues/6679

Description (What does it do?)

This renames the table as described. Additionally a Postgres view is created so the table is still accessible under the previous name so we don't see errors during deployment.

How can this be tested?

• Before switching to this branch, you should probably backup your db:
  docker compose exec db pg_dump --file=/mnt/backups/dump.sql -U postgres -W -d postgres
• Start the app, the migrations should succeed and the app should run.
• Check the db schema, the following should be true:
  • The auth_user table should be renamed to users_user.
  • In the db, SELECT * from django_content_type WHERE model = 'user'; should show that the app_label has been updated to "users"

Be sure to ./manage.py migrate users 0001 before switching back to other branches

[shanbady]

👍