feat: Allow Duo Chat to be used outside of GitLab project

Description

We can allow users to use chat for non-GitLab projects as long as they have eligible GitLab account linked to the extension.

Related Issues

Enable Chat Feature Outside of GitLab Project C... (gitlab#431354 - closed)

Resolves #1091 (closed)

How has this been tested?

• Use Duo Chat for any project which is not hosted at gitlab.com

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