VirtualCircuits require VLAN in the create requests starting Feb 29, 2024

[displague]

There is an upcoming requirement for VLAN in the requests: https://feedback.equinixmetal.com/changelog/virtual-circuits-will-require-vlans-on-feb-29-2024

Since #141 allows for vlan to be defined (as nni_vlan, vlan_id, also vrf_id), it is fine that the user will receive a 422 from the API server prompting them to add vlan in their Ansible configuration.

The field should be denoted as required in Ansible to match the API expectation.

Originally posted by @displague in #141 (comment)