The aggregation operators chosen automatically changes on changing a metric name in a panel

[ankitnayan]

The aggregation operators chosen automatically changes on changing a metric name in a panel.

When a metric name is selected, based on the metric type, the time and space aggregation operators are selected automatically. This is fine when the metric type of the previous is different from the current one.

If the previous metric type matches the currently selected one, maintain the chosen time and space aggregate operators without resetting them.