Holocene: Sepolia `SystemConfig` upgrades

[sebastianst]

• Use holocene upgrade script to create task(s) for all Sepolia chains that we manage (OP, Base (?), MMZ)
  • For OP Seb has already done it, will upload output tasks.
  • For Base TBD, probably Seb will generate it too.
  • For other chains, can use tool, but with FPs disabled.
• Possibly bundle all upgrade transactions into a single input.json bundle and task
• Add validation Solitidy script (can copy another proxy upgrade script as a starting point, e.g. https://github.com/ethereum-optimism/superchain-ops/tree/main/tasks/sep-dev-0/006-holocene-sys-cfg is close, but without the manual MCP upgrade via the StorageSetter, only the last tx in the bundle)
• Execute soon after Holocene activation on 11/26