jason add max cooldown times label

[Jason-Liu-Dream]

related to volcano pr #2363
add a new label "volcano.sh/max-cooldown-times" to indicate cool down time for preempted

[volcano-sh-bot]

Welcome @Jason-Liu-Dream!

It looks like this is your first PR to volcano-sh/apis 馃帀.

Thank you, and welcome to Volcano. 😃

[volcano-sh-bot]

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[Jason-Liu-Dream]

/assign @william-wang

[volcano-sh-bot]

@Jason-Liu-Dream: PR needs rebase.

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