fix(cli): shell-safe single-quoting of generated --data examples

The cligen example help wrapped the spec's example JSON in single quotes
(--data '<json>') without escaping embedded single quotes, so an example
whose JSON contained a "'" produced a command that breaks out of the
shell quoting when copy-pasted. This was live: the monit query-diagnose
example carries a VictoriaLogs query `_stream:{status='500'}`, whose
quotes split the argument in a real shell.

Escape embedded single quotes as the standard '\'' sequence via a
shellSingleQuote helper. The escaped example round-trips through bash back
to valid JSON. Also clears the pre-existing go/unsafe-quoting CodeQL alert,
which this PR's exampleHelp refactor had re-attributed to the diff.

Author: ysyneu

internal/cli/zz_generated_diagnostics.go

@@ -1096,7 +1096,15 @@ func exampleHelp(o specOp) string {
 	if o.Example == "" {
 		return ""
 	}
-	return "  flashduty " + cliGroup(o.Path) + " " + cliVerb(o.Path) + " --data '" + o.Example + "'"
+	return "  flashduty " + cliGroup(o.Path) + " " + cliVerb(o.Path) + " --data " + shellSingleQuote(o.Example)
+}
+
+// shellSingleQuote wraps s in single quotes safe for a POSIX shell, escaping any
+// embedded single quote as the standard '\” sequence so a copy-pasted --data
+// example never breaks out of the quoting (a JSON string value such as an
+// apostrophe-bearing name would otherwise corrupt the example).
+func shellSingleQuote(s string) string {
+	return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
 }
 
 func flagUsage(f specField) string {