Feat: enable unknown flags (#6303)

Signed-off-by: yyzxw <1020938856@qq.com>

cmd/core/app/server.go

@@ -75,6 +75,10 @@ func NewCoreCommand() *cobra.Command {
 			return run(signals.SetupSignalHandler(), s)
 		},
 		SilenceUsage: true,
+		FParseErrWhitelist: cobra.FParseErrWhitelist{
+			// Allow unknown flags for backward-compatibility.
+			UnknownFlags: true,
+		},
 	}
 
 	fs := cmd.Flags()

references/cli/cli.go

@@ -60,6 +60,10 @@ func NewCommandWithIOStreams(ioStream util.IOStreams) *cobra.Command {
 		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 			return nil, cobra.ShellCompDirectiveNoFileComp
 		},
+		FParseErrWhitelist: cobra.FParseErrWhitelist{
+			// Allow unknown flags for backward-compatibility.
+			UnknownFlags: true,
+		},
 	}
 
 	scheme := common.Scheme