Startup Policy Task demonstrating leader-worker pattern

[danielvegamyhre]

What would you like to be added:
Startup Policy Task demonstrating leader-worker pattern added to tasks

Why is this needed:
This is so users are aware of the feature and have an e2e example to get started with it.

[kannon92]

I have used https://github.com/kubernetes-sigs/jobset/blob/main/examples/simple/success-policy.yaml in presentations to demonstrate a leader-worker pattern where leader is terminated once the workers are finished.

[danielvegamyhre]

I have used https://github.com/kubernetes-sigs/jobset/blob/main/examples/simple/success-policy.yaml in presentations to demonstrate a leader-worker pattern where leader is terminated once the workers are finished.

Yeah that example is great, I think we just need to add it here so the docsite is up to date with the latest features.

[danielvegamyhre]

/assign

Fixed by #453