Revert "Tenant provisioning in the dataplane"

[pablonyx]

Reverts #2590

[greptile-apps]

PR Summary

This pull request reverts changes related to tenant provisioning in the dataplane, specifically reverting PR #2590. Here are the key points:

• Removed multi-tenant functionality: The changes remove code related to tenant management, including the deletion of files in the backend/ee/danswer/server/tenants/ directory.

• Simplified authentication: The control_plane_dep function and related imports have been removed from backend/danswer/auth/users.py, simplifying the authentication process.

• Reverted database session handling: In backend/danswer/chat/load_yamls.py, functions now create their own database sessions instead of receiving them as parameters.

• Removed environment variables: DATA_PLANE_SECRET and EXPECTED_API_KEY have been removed from backend/danswer/configs/app_configs.py.

• Updated schema validation: The regex for schema name validation in backend/danswer/db/engine.py has been modified to enforce stricter naming rules.

• Reintroduced setup functions: setup_postgres and setup_vespa functions have been moved back to danswer.main from a separate setup file.

These changes significantly alter the application's structure and functionality, reverting the multi-tenant and dataplane-specific features introduced in the previous PR.

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[greptile-apps]

logic: Deletion of tenant creation API may break multi-tenant functionality. Ensure this is intentional and alternative methods for tenant management are in place.