Improve messaging for missing service SID in list command

[dkundel]

Right now when you run twilio serverless:list outside of a deployed project project it fails with:

It should instead:

1. tell people to find existing services through list services
2. listing services should be the default

twilio serverless:list

│ ERROR Could not find Service SID
│
│ We could not find a Twilio Serverless Service SID to perform this action.
│
│ You can either pass the Service SID via the "--service-sid" flag or by storing it in a ".twilio-functions" file
│ inside your project like this:
│
│   {
│     "serviceSid": "ZSf9dec7e059e0695f4c8axxxxxxxxxxxx"
│   }