* Support custom annotations and labels when testing contact points
* Add modal for testing contact point
* add option for custom notification type
* use annotation and labels fields from rule editor
* update receivers test for new contact point testing method
* rename modal and remove reserved keys for annotations
* add docs for testing contact points
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
Co-authored-by: George Robinson <george.robinson@grafana.com>
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
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