fix： allow predicate checkout of podgroup UpdateFunc

[tsuiot]

What this PR does / why we need it:
when apply paddlepaddleJob with enable gang schedule, that the operator SyncPodGroup and delay pods creation until podgroup status is inqueue, the operator update LastReconcileTime of jobStatus in each reconcile that can trigger next Reconcile.
when the last two LastReconcileTime is same in second, then canot tigger next reconcile in watch loop. and this paddlepaddleJob is always in pendding, unless reboot training-operator pod or modify paddlepaddleJob.
for the above bug, it can tigger by podgroup status change, but OnDependentUpdateFunc in reconciler.go only allow pod/service, my pr is fix to allow tigger event loop by podgroup update

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #

Checklist:

• Docs included if any changes are user facing

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[tsuiot]

PS: this pull request is 2/2 fix bug of training-operator`s reconcile event loop.
another pr: kubeflow/common#202

[tenzen-y]

@tsuiot Thanks for reporting this and submitting this patch.
Probably, that bug will be fixed by #1730 since we need to use generic predicates for PodGroup, the same as other controllers.

[johnugeorge]

Can we close this PR as #1730 is merged