Fallback from V2 auth services to V1 auth services

[gestchild]

Follows on from to https://github.com/wellcomecollection/platform/issues/5759

Our iiif manifests can contain auth V1 and auth V2 services, or just auth v1 services (they need to be recently generated to have the v2 services). We want to move to using V2 but can't guarantee all manifests will include them, so we will need to attempt to use V2 and fallback to V1.