Adds ability to set notifications settings using the Prometheus conversion API.
The API now supports a new optional header: X-Grafana-Alerting-Notification-Settings which can be used to specify notification settings.
The value of the header is the AlertRuleNotificationSettings structure in JSON:
mimirtool rules load alerts.yaml --extra-headers 'X-Grafana-Alerting-Notification-Settings: {"receiver": "my-webhook", "group_by": ["cluster", "pod"]}'
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