[feature request] Delete the completed tfjob created by cron when tfjob number reach historyLimit

[heluocs]

What would you like to be added:

Cron support delete the completed tfjob when the tfjob number reach the historyLimit.

Why is this needed:

With the tfjob number in kubernetes cluster increased, the performance of training operator will decrease.

[SimonCqk]

@heluocs hi heluocs, it looks make sense, we'll implement it soon :)

[sbdtu5498]

/assign
@SimonCqk correct me if I am wrong. I checked the cron controller but this feature is not there yet. I will make a PR for this.

[SimonCqk]

well, it has not implemented yet, it looks good if you'd like to contribute!