Apply the labels model for the labels field in `google_monitoring_notification_channel` resource

[zli82016]

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Description

Apply the labels model for the labels field in google_monitoring_notification_channel resource.

What need to do:

1. Use the type KeyValueLabels for the labels field.
2. Add the state upgrader if needed to suppress the perma-diffs.

New or Affected Resource(s)

• google_monitoring_notification_channel

Potential Terraform Configuration

References

No response