fix: Fabricv4 patch project response

Removed required field for projectId from project model to resolve customer issue with Terraform Provider
- https://github.com/equinix/terraform-provider-equinix/issues/657
- Error is caused by Equinix Fabric API returning an empty project project: {} in the JSON response for PDS user accounts
- Adding temporary patch until Equinix Fabric API teams remove the empty project from the API response
- Does affect request models as well, but the API will return the error that project is required for those requests. Will revert as soon as we can

equinix / equinix-sdk-go