Voluntary exit CLI command (#7046)

* initial implementation of command

* Add second confirmation step

* fix variable name

* added unit tests

* add comment about stdin

* code review fixes

* removed commented-out code

* added log assert

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

tools/keystores/main.go

@@ -154,6 +154,7 @@ func encrypt(cliCtx *cli.Context) error {
 	}
 	if fileutil.FileExists(fullPath) {
 		response, err := promptutil.ValidatePrompt(
+			os.Stdin,
 			fmt.Sprintf("file at path %s already exists, are you sure you want to overwrite it? [y/n]", fullPath),
 			func(s string) error {
 				input := strings.ToLower(s)