refactor(p2p/simulations): remove unused func setSocketBuffer

[gzliudan]

Proposed changes

Remove setSocketBuffer from inproc adapter since it is no longer needed.

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[Copilot]

Pull request overview

Removes the unused setSocketBuffer helper from the in-process simulations adapter (p2p/simulations), reducing dead code in the networking simulation utilities.

Changes:

• Deleted the unreferenced setSocketBuffer(net.Conn, int, int) error function from the inproc adapter.