Enable rollup.superchain-upgrades flag by default

This will ensure that nodes are automatically upgraded to the correct hardfork
if the op-network flag is not set but the node is upgraded to the HF ready
version.

cmd/utils/flags.go

@@ -920,6 +920,7 @@ var (
 		Aliases:  []string{"beta.rollup.superchain-upgrades"},
 		Usage:    "Apply superchain-registry config changes to the local chain-configuration",
 		Category: flags.RollupCategory,
+		Value:    true,
 	}
 
 	// Metrics flags