Deprectate EnableDebugRPCEndpoints flag (#14015)

* Deprectate `EnableDebugRPCEndpoints` flag

* test fix

* add flag to deprecated list

* disable by default

* test fixes

cmd/beacon-chain/flags/base.go

@@ -174,10 +174,10 @@ var (
 		Usage: "The factor by which blob batch limit may increase on burst.",
 		Value: 2,
 	}
-	// EnableDebugRPCEndpoints as /v1/beacon/state.
-	EnableDebugRPCEndpoints = &cli.BoolFlag{
-		Name:  "enable-debug-rpc-endpoints",
-		Usage: "Enables the debug rpc service, containing utility endpoints such as /eth/v1alpha1/beacon/state.",
+	// DisableDebugRPCEndpoints disables the debug Beacon API namespace.
+	DisableDebugRPCEndpoints = &cli.BoolFlag{
+		Name:  "disable-debug-rpc-endpoints",
+		Usage: "Disables the debug Beacon API namespace.",
 	}
 	// SubscribeToAllSubnets defines a flag to specify whether to subscribe to all possible attestation/sync subnets or not.
 	SubscribeToAllSubnets = &cli.BoolFlag{

cmd/beacon-chain/main.go

@@ -64,7 +64,7 @@ var appFlags = []cli.Flag{
 	flags.InteropNumValidatorsFlag,
 	flags.InteropGenesisTimeFlag,
 	flags.SlotsPerArchivedPoint,
-	flags.EnableDebugRPCEndpoints,
+	flags.DisableDebugRPCEndpoints,
 	flags.SubscribeToAllSubnets,
 	flags.HistoricalSlasherNode,
 	flags.ChainID,

cmd/beacon-chain/usage.go

@@ -116,7 +116,7 @@ var appHelpFlagGroups = []flagGroup{
 			flags.BlockBatchLimitBurstFactor,
 			flags.BlobBatchLimit,
 			flags.BlobBatchLimitBurstFactor,
-			flags.EnableDebugRPCEndpoints,
+			flags.DisableDebugRPCEndpoints,
 			flags.SubscribeToAllSubnets,
 			flags.HistoricalSlasherNode,
 			flags.ChainID,