CLI - `rename` should remove the old name

[bfops]

The current spacetime rename command just adds a new name for the DB, but doesn't remove the old one.

@cloutiertyler says:

There is an API to actually change the name
It's new-ish, but it is in use in the website

So we should use that in the CLI as well.

[cloutiertyler]

https://github.com/clockworklabs/spacetime-web/blob/6dca42defe49f1aa36f9494bd59d17f1a4ec98db/spacetimedb.com/app/.server/api/proxy.ts#L182

This is the call on the server

[jdetter]

#2764