feat: add --replace-with flag for client replacement during restart

[KatyaRyazantseva]

Summary

• Add --replace-with flag that works alongside --restart-client to swap clients while keeping the same validator index, keys, and server
• Re-syncs leanpoint and Nemo when node set changes due to replacement
• Add --logs flag to log client runs

Usage

# Replace zeam_0 with ream_0
NETWORK_DIR=ansible-devnet ./spin-node.sh --restart-client zeam_0 --replace-with ream_0 --useRoot --logs --checkpoint-sync-url https://leanpoint.leanroadmap.org/lean/v0/states/finalized

# Replace first node, just restart second
NETWORK_DIR=ansible-devnet ./spin-node.sh --restart-client zeam_0,ream_0 --replace-with qlean_0 --logs --checkpoint-sync-url https://leanpoint.leanroadmap.org/lean/v0/states/finalized

[ch4r10t33r]

Looks good.