podgroup conditions

Backgrounds

Currently, there are only two podgroup condition type: Unschedulable and Scheduled. If job is not enqueued, it has not been scheduled. And the event reason is Unschedulable and podgroup condition reason is NotEnoughResources. These reasons is not coresponding with the real reason job is not enqueued

Motivation

In order to classify the uninqueueable reason from other unscheduleable reasons

Design

1. add Uninqueueable reason for podgroup events

 // PodGroupUnInqueueable is Uninqueueable event type
 PodGroupUnInqueueable PodGroupConditionType = "Uninqueueable"

2. add NotInqueueable reason for podgroup conditions reason

 // NotInqueueableReason if probed if job is rejected to enqueue
 NotInqueueableReason string = "NotInqueueable"