Proposal: apstra_telemetry_service_registry_entry rename service_name to name

[chrismarget-j]

I think we should rename service_name to name in the apstra_telemetry_service_registry_entry resource and data source.

Reasons:

1. "service" is redundant. It's already a service registry entry.
2. The GUI uses both service name and name for this attribute, so it's not clear that one is preferred over the other.
3. name is consistent with our other resources.
4. The resource doesn't have an id attribute. With neither an id nor name attribute, Terraform's ObjectValueId() function won't find any identifier to use in user-facing output for this resource.

[rajagopalans]

I am fine with this. I didn't have a strong opinion, so I just used what was in the API.

[rajagopalans]

closed by #725