fix(aci): use relaxed date type

Author: natemoo-re

static/app/components/workflowEngine/gridCell/timeAgoCell.tsx

@@ -2,7 +2,7 @@ import TimeSince from 'sentry/components/timeSince';
 import {EmptyCell} from 'sentry/components/workflowEngine/gridCell/emptyCell';
 
 type TimeAgoCellProps = {
-  date?: Date;
+  date?: string | Date;
 };
 
 export function TimeAgoCell({date}: TimeAgoCellProps) {