Remove dev servers (#19638)

TODO:

- [ ] Check that workspace migration worked
- [ ] Add server migrations and make sure SeaORM files are in sync
(maybe?)

Release Notes:

- N/A

---------

Co-authored-by: Conrad <conrad@zed.dev>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/collab/src/db/tables.rs

@@ -13,8 +13,6 @@ pub mod channel_message;
 pub mod channel_message_mention;
 pub mod contact;
 pub mod contributor;
-pub mod dev_server;
-pub mod dev_server_project;
 pub mod embedding;
 pub mod extension;
 pub mod extension_version;