feat: show all configured hosts in interactive login prompt

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Description

This fix ensures that the interactive auth login does list all configured hosts.

Before this chage the list only showed:

$ glab auth login
? What GitLab instance do you want to sign in to?  [Use arrows to move, type to filter]
> gitlab.com
  GitLab Self-Managed or GitLab Dedicated instance

and did miss any existing hosts from the config.

after:

$ glab auth login
? What GitLab instance do you want to sign in to?  [Use arrows to move, type to filter]
> gitlab.com
  example.self.hosted.local
  GitLab Self-Managed or GitLab Dedicated instance

Markus Sattler markus.sattler@mercedes-benz.com, Mercedes-Benz Tech Innovation GmbH

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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)
• Test gap