Distributed Task / Kubernetes / Add missing serviceEndpointId in request body

[theitalianz]

Link to docs: https://docs.microsoft.com/en-us/rest/api/azure/devops/distributedtask/kubernetes/add?view=azure-devops-rest-6.0

Issue originated here: microsoft/azure-devops-go-api#116

Documented:

Required:

The 500 when serviceEndpointId is omitted:

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