core-services/prow/README: Talk about Boskos capacity

[wking]

To give folks a quick summary of how we use this in OpenShift and a link to the relevant configuration.

Spun out from #10166, because I want to link this same section when talking about AWS rebalancing too.

[openshift-ci-robot]

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[wking]

Nevermind, we have https://steps.ci.openshift.org/help/leases .

/close

[openshift-ci-robot]

@wking: Closed this PR.

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In response to this:

Nevermind, we have https://steps.ci.openshift.org/help/leases .

/close

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