insights: persisted global capture groups loading state should match normal loading state

Created by: Joelkw

Both of these insights have not run yet, but they show different states:

Right side: capture group that hasn't run yet. Left side: normal global search insights.

We should show the same loading state for both, that the capture group insight is processing, not "no data to display." This will mislead users to thinking their query was wrong because they would expect both to show the loading state.

I realize there may be some backend complexity in how we expose loading state from compute.