Add 'required' flag to "loadBalancingScheme" for the traffic extension resource

[maxi-cit]

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request.
• Please do not leave +1 or me too comments, they generate extra noise for issue followers and do not help prioritize the request.
• If you are interested in working on this issue or have submitted a pull request, please leave a comment.
• If an issue is assigned to a user, that user is claiming responsibility for the issue.
• Customers working with a Google Technical Account Manager or Customer Engineer can ask them to reach out internally to expedite investigation and resolution of this issue.

Description

According to this API docs this field should be 'required'

New or Affected Resource(s)

• google_network_services_lb_traffic_extension

Potential Terraform Configuration

No response

References

Issues

• Add new resources to support Service Extensions callouts for Cloud Load Balancing #17491
• Send "google_network_services_lb_traffic_extension" to G.A #17373

Docs

• https://cloud.google.com/service-extensions/docs/callouts-overview

API

• https://cloud.google.com/service-extensions/docs/reference/rest/v1beta1/projects.locations.lbTrafficExtensions

b/343221114