Refactor editor prompt to unblock tests

[Widcket]

Description

Currently, it is not possible to add integration tests for any command that involves opening an external code editor, such as rules create or rules update. The editor prompt does not honor the --no-input flag, and we'd also need to add support for an alternative input method (e.g. piping).

This PR tackles the first problem, by having the editor prompt use the same code infrastructure as the rest of the prompts. That makes the editor behave similarly to the other prompts, e.g honoring --no-input and handling errors the same way.

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[cyx]

Looks great! Is there a UX change or is it completely transparent?

[Widcket]

It is transparent.