Remove client-go bindings from cmd

For now, client-go bindings will be removed from the diff command.

Doing this because when diffing between multiple remote environments, it
becomes ambiguous which environment cluster the flags should belong to.

cmd/diff.go

@@ -29,7 +29,6 @@ const flagDiffStrategy = "diff-strategy"
 
 func init() {
 	addEnvCmdFlags(diffCmd)
-	bindClientGoFlags(diffCmd)
 	bindJsonnetFlags(diffCmd)
 	diffCmd.PersistentFlags().String(flagDiffStrategy, "all", "Diff strategy, all or subset.")
 	RootCmd.AddCommand(diffCmd)