Removal of the ProveReplicaUpdates method from the miner actor

[rvagg]

I'm proposing the removal of the ProveReplicaUpdates method (Method 27) from the miner actor.

This method has been effectively (not technically) deprecated since the introduction of ProveReplicaUpdates3, which provides the same functionality with greater flexibility for handling Snap Deals operations.

On-chain analysis indicates this method has not been actively used for at least six months, with storage providers having migrated to the newer ProveReplicaUpdates3 method. Code to use it was been removed from Lotus Miner for some time and was never implemented in Curio.

This proposal follows the same pattern as FIP-0101 and FIP-0103, which proposed removing other superseded methods (ProveCommitAggregate and ExtendSectorExpiration respectively).

The proposed removal would help reduce technical debt and simplify the protocol without impacting current operations, as all Snap Deals functionality is already covered by ProveReplicaUpdates3. Storage providers and tooling have already migrated to using the newer method, making this a safe change.

It's important to note that this FIP does not remove Snap Deals functionality - it only removes the redundant legacy method while preserving full functionality through the more flexible ProveReplicaUpdates3 method.

FIP pull request: #1152