[feature] Add new trials to a succeeded Experiment

[gaocegege]

/kind feature

Describe the solution you'd like
[A clear and concise description of what you want to happen.]

Now we cannot achieve it because of:

	reconcileRequired := !instance.IsCompleted()
	if reconcileRequired {
		r.ReconcileTrials(instance, trials.Items)
	}

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

[johnugeorge]

Yes. We have to add extra check when we support resuming trials

[gaocegege]

/priority p3

[johnugeorge]

#952