Add KEP for jobSet DependsOn with WaitforPodsReady

[MaysaMacedo]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

KEP for #6796

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Does this PR introduce a user-facing change?

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This pull-request has been approved by: MaysaMacedo
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[MaysaMacedo]

@mimowo I'm still working out design and implementation details.
But, can you check if this is aligned with what you have in mind?