fix(cli): Do not show headers when listing empty lists

[raulb]

Description of change

I noticed that when listing resources, pipelines, etc... even though the output is empty, we still show the header.

Before:

❯ .m list resources
 ID   TYPE   NAME   URL
==== ====== ====== =====

Now:

❯ .m list resources

Fixes PLATFORM-68

Type of change

• New feature
• Bug fix
• Refactor
• Documentation

How was this tested?

• Unit Tests
• Deployed to staging

[mwoods79]

@raulb shouldn't we show the user something though? Like "no results", just some type of feedback?

[raulb]

@mwoods79 I was trying to follow the same pattern we had in Heroku when listing items and they didn't return any result:

❯ heroku teams

I personally think the feedback of showing an empty line could be a good start without getting into the weeds of what the right message is. What do you think?

[mwoods79]