molecule-gce is affected by ansible-community/molecule#3689

[Aftermath]

When attempting to use molecule-gce per the README.md, settings contained in the driver section of molecule.yml are rejected:

$  molecule list
CRITICAL Failed to validate /home/blah/git/ansible-qe/roles/gce/molecule/rhel8/molecule.yml

["Additional properties are not allowed ('auth_kind', 'external_access', 'instance_os_type', 'network_name', 'project_id', 'region', 'scopes', 'service_account_email', 'service_account_file', 'subnetwork_name', 'username', 'vpc_host_project' were unexpected)"]

Syntax checking in vscode shows that all of the gce driver specific properties other than name are rejected by MoleculeDriverModel schema.

See ansible/molecule#3689