fix: add custom role type and validation

[BibiSebi]

Issue:
EXT-2001

What?

Users with custom roles are being redirected to the errorCallback page. This is an unexpected behavior.

Here a reference for better understaning:

1. Response from /oauth/user_info with the backed-in storyblok role (admin or editor)

{
    "user": {
        "id": 123,
        "friendly_name": "Bibiana"
    },
    "space": {
        "id": 1234,
        "name": "Test"
    },
    "roles": [
        {
            "name": "admin"
        }
    ]
}

2. Response from /oauth/user_info with a custom role user:

{
    "user": {
        "id": 123,
        "friendly_name": "Bibiana"
    },
    "space": {
        "id": 1234,
        "name": "Test"
    },
    "roles": [
        {
            "id": 1,
            "resolved_allowed_paths": [],
            "allowed_paths": [],
            "field_permissions": [],
            "readonly_field_permissions": [],
            "permissions": [],
            "role": "Developer",
            "subtitle": null,
            "datasource_ids": [],
            "component_ids": [],
            "branch_ids": [],
            "allowed_languages": [],
            "asset_folder_ids": [],
            "ext_id": null
        },
    ],
}

The problem happens when validating the role object:

const isRole = (obj) => 'name' in obj && typeof obj.name === 'string'

As the custom role has no nameproperty this validation fails.

Support Ticket: EXT-2001

[eunjae-lee]

I had a wrong understanding of this issue yesterday. Now I see what you mean. Looks good!