Prop 491: Accept AxelarServiceGovernance ownership of ITS and amplifier Gateways

Complete the ownership migration to AxelarServiceGovernance: ScheduleTimeLockProposal(acceptOwnership()) delivered via AxelarnetGateway.call_contract to ASG on each chain. Targets InterchainTokenService on all 21 EVM chains, plus AxelarAmplifierGateway on hedera, hyperliquid, monad, xrpl-evm.