cmd/geth, node: allow configuring JSON-RPC on custom path prefix (#22184)

This change allows users to set a custom path prefix on which to mount the http-rpc
or ws-rpc handlers via the new flags --http.rpcprefix and --ws.rpcprefix.

Fixes #21826

Co-authored-by: Felix Lange <fjl@twurst.com>

node/api_test.go

@@ -244,7 +244,10 @@ func TestStartRPC(t *testing.T) {
 	}
 
 	for _, test := range tests {
+		test := test
 		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
 			// Apply some sane defaults.
 			config := test.cfg
 			// config.Logger = testlog.Logger(t, log.LvlDebug)