feat(commands/mr/create): prompt for labels with --autofill

Created by: maxice8

Description

Split the cmdutils.LabelsPrompt logic into its own block that checks.

1. Is it interactive ?
2. was --autofill used but --yes not used, OR
3. was --autofill not used

Related Issue

Resolves #448 (closed)

How Has This Been Tested?

See screenshots:

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)