fix(data-warehouse): Only expose certain tables via the warehouse table view and autocomplete

[Gilbert09]

Problem

• Updates the database table logic to only expose listed tables in both hogql autocomplete, and within data warehouse table explorer

Changes

• Semi-reverts this from @mariusandra https://github.com/PostHog/posthog/pull/21970
• Updated the internal _table_names in Database to only include tables we'd like to expose, and also removes any other dependency on this list from outside of the Database class
• Updated references from data warehouse and autocomplete

Does this work well for both Cloud and self-hosted?

• Yes

How did you test this code?

• Tested creating views with conflicting names, and autocomplete