fix(fields): await running queries during trigger (#8391)

# Which Problems Are Solved

During triggering of the fields table WriteTooOld errors can occure when
using cockroachdb.

# How the Problems Are Solved

The statements exclusively lock the projection before they start to
insert data by using `FOR UPDATE`.

internal/eventstore/handler/v2/field_handler.go

@@ -113,6 +113,8 @@ func (h *FieldHandler) processEvents(ctx context.Context, config *triggerConfig)
 		}
 	}()
 
+	// always await currently running transactions
+	config.awaitRunning = true
 	currentState, err := h.currentState(ctx, tx, config)
 	if err != nil {
 		if errors.Is(err, errJustUpdated) {