cmd/utils: remove deprecated command line flags (#22263)

This removes support for all deprecated flags except --rpc*.

cmd/geth/run_test.go

@@ -75,7 +75,7 @@ func runGeth(t *testing.T, args ...string) *testgeth {
 			if i < len(args)-1 {
 				tt.Datadir = args[i+1]
 			}
-		case "--etherbase":
+		case "--miner.etherbase":
 			if i < len(args)-1 {
 				tt.Etherbase = args[i+1]
 			}