Issue with group-level thresholds in UIv4

In Uiv4, we now have the option to add a custom trigger or clear interval at the instance or group-level. This is good, but I noticed that if you don't set a custom trigger or clear interval on the threshold, then it defaults to "immediately" for the trigger/clear intervals.

My feature request is to have the default trigger/clear interval be "inherit from datasource", and then if we want to customize at the group-level we can do so.

Having the default trigger interval be "Immediately" for any instance or group-level threshold causes lots of problems if we have users setting thresholds who aren't aware that it will overwrite any trigger/clear interval set on the datasource-level.