test(supabase): Stop supabase before initializing

[JPeer264]

closes #20214

The test failed with:

failed to start docker container: Error response from daemon: failed to set up container networking: driver failed programming external connectivity on endpoint supabase_db_test-application (a2890079e9476a7ded9e9fbba9a9a60e82b00e74ea23f746beef34d99cbfb830): failed to bind host port for 0.0.0.0:54322:172.18.0.2:5432/tcp: address already in use

So for some reason the runner was reusing something from before, where the container ran. With that we stop Docker via the supabase CLI and then init it.