show migration new help when called without arguments

[kandros]

print help instead of validation error when passing 0 or more than 1 arguments to migration new

What kind of change does this PR introduce?

feature

What is the current behavior?

What is the new behavior?

[kandros]

@soedirgo @sweatybridge I've seen this behaviour in many commands, if the change I made is ok for you I can use it to more commands

what do you think?

I don't like much the unchecked error _ = cmd.Help() cause it will never error but the linter is enforcing that check

[soedirgo]

Hey there, sorry for the late response. I think you can just remove this line to show usage for all commands:

https://github.com/supabase/cli/blob/3968f1cb2c75cdd797e266453086851d7d493c45/cmd/root.go#L26

[sweatybridge]

Closing this in favour of #562