Add terms-of-service agreement parameter to the login command in the CLI if you are logging into the website

[cloutiertyler]

We determined a EULA for the CLI is unnecessary: https://github.com/clockworklabs/SpacetimeDB/blob/0da26ceaacb531e7367a26cd4509af514749b746/crates/update/src/cli/self_install.rs#L35

However, terms of service for the website + maincloud is eventually necessary. We should do a similar check upon login for the first time to the website through the CLI.