[EFM Recovery] Update bootstrapping process to be able to join the network in EFM.

[durkmurder]

Context

Currently we don't allow bootstrapping while we are in EFM, meaning no new nodes can join the network when we have entered it. By using this simplification we have simpler implementation of bootstrapping logic. InstanceParams returns flag from DB to report epoch fallback mode: https://github.com/onflow/flow-go/pull/5113/files#diff-993b1b13f491511e3966413c7eee41741a117e4c3745376574ec3ba475b57e8fR108, if we have bootstrapped after entering EFM this will return always false since we didn't populate that DB flag. Similar reasoning is used in updateEpochMetrics.

For more details read Jordan's comment.

Most likely we will need to update logic for producing snapshots but that should go into a separate issue.

Definition of done

• Allow bootstrapping nodes in EFM
• Nodes that are joining the network in EFM have to carry that information in root snapshot and InstanceParams.EpochFallbackTriggered() should return true in this case. (Most likely dynamic protocol state can be used for that)
• Add a test case for bootstrapping a node from an EFM snapshot

Depends on

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1. [EFM] Add EpochExtension to Epoch Data Model #5717
   S-BFT S-Epochs +2