Eitan Seri-Levi defdc595fc Prevent writing to state cache when migrating the database (#7067) ...

* add an update_cache flag to get_state to have more granular control over when we write to the cache

* State cache tweaks

- add state-cache-headroom flag to control pruning
- prune old epoch boundary states ahead of mid-epoch states
- never prune head block's state
- avoid caching ancestor states unless they are on an epoch boundary

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Co-authored-by: Michael Sproul <michael@sigmaprime.io>

2025-03-04 11:15:12 +11:00

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