Connection with OAuth doesn't include scopes

[leblancfg]

Describe the bug
The OAuth debugger includes all the scopes_supported values in the Authorization URL step as a query param, but even if scope is marked as required in the authorization server metadata, the scope query param isn't included in the URL when clicking the "Connect" button.

Expected behavior
The authorization URL for the two OAuth connection methods (debugger or simple "connect" button) should match exactly.

Related PR: #355