Commonize the code for checking if workload is managed by Kueue

[mimowo]

What would you like to be cleaned:

As in the comment we have two instances of the same logic:

1. in WorkloadShouldBeSuspended - first two checks
2. and in the new LWS PR we have IsManagedByKueue

Why is this needed:

To avoid duplication of complex logic, and so to reduce a chance of bugs.

[mimowo]

/assign @mbobrovskyi

[mimowo]

@mbobrovskyi is it still a valid task?

[mbobrovskyi]

@mbobrovskyi is it still a valid task?

Yes, we need to use IsManagedByKueue function here https://github.com/kubernetes-sigs/kueue/blob/main/pkg/controller/jobframework/defaults.go#L55-L57 and also need to check other places.

[mimowo]

Thanks!