Fix: proper sorting resources by age column (#2182)

* - fix: proper sorting for resource age column
- use Date.now() instead of new Date().getTime() (#2141 follow-up)

Signed-off-by: Roman <ixrock@gmail.com>

* fix: proper bar-chart tooltip callback

Signed-off-by: Roman <ixrock@gmail.com>

* fix: sorting in cronjobs, more Date.now() replacements

Signed-off-by: Roman <ixrock@gmail.com>

src/renderer/components/kube-object-status-icon/kube-object-status-icon.tsx

@@ -48,7 +48,7 @@ export class KubeObjectStatusIcon extends React.Component<Props> {
 
   getAge(timestamp: string) {
     if (!timestamp) return "";
-    const diff = new Date().getTime() - new Date(timestamp).getTime();
+    const diff = Date.now() - new Date(timestamp).getTime();
 
     return formatDuration(diff, true);
   }