v2.1: runtime: migrate stake program to core bpf (backport of #3655)

[mergify]

Problem

with the bpf stake program preparing for audits, we would like to add the runtime hooks to deploy it when ready

Summary of Changes

add support for the core bpf stake program migration

Feature Gate Issue: #3654

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This is an automatic backport of pull request #3655 done by Mergify.

[2501babe]

(note to backport reviewers: this is the hook to activate the bpf stake program switchover at some date in the future. on its own, it entails no change in functionality. it will be activated after the program has finished audits and firedancer gives final signoff)