[10.x] Prevent session:table command from creating duplicates

[jessarcher]

This PR adds a check to prevent the session:table command from creating multiple migrations for the session table, which will fail when migrating.

We have a check for this in the Jetstream installer, but it doesn't work with anonymous migrations. Rather than fix it there, I've created laravel/jetstream#1385 to remove the check in favour of doing it here.