feat(testutil): add GetRandomNameHyphenated (#17342)

This started coming up more often for me, so time for a test helper!

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

testutil/names.go

@@ -2,6 +2,7 @@ package testutil
 
 import (
 	"strconv"
+	"strings"
 	"sync/atomic"
 	"testing"
 
@@ -25,6 +26,14 @@ func GetRandomName(t testing.TB) string {
 	return incSuffix(name, n.Add(1), maxNameLen)
 }
 
+// GetRandomNameHyphenated is as GetRandomName but uses a hyphen "-" instead of
+// an underscore.
+func GetRandomNameHyphenated(t testing.TB) string {
+	t.Helper()
+	name := namesgenerator.GetRandomName(0)
+	return strings.ReplaceAll(name, "_", "-")
+}
+
 func incSuffix(s string, num int64, maxLen int) string {
 	suffix := strconv.FormatInt(num, 10)
 	if len(s)+len(suffix) <= maxLen {