refactor: replace HasPrefix+TrimPrefix with CutPrefix

Signed-off-by: joemicky <joemickychang@outlook.com>

pkg/cmd/release_testing.go

@@ -59,8 +59,8 @@ func newReleaseTestCmd(cfg *action.Configuration, out io.Writer) *cobra.Command
 			client.Namespace = settings.Namespace()
 			notName := regexp.MustCompile(`^!\s?name=`)
 			for _, f := range filter {
-				if strings.HasPrefix(f, "name=") {
-					client.Filters[action.IncludeNameFilter] = append(client.Filters[action.IncludeNameFilter], strings.TrimPrefix(f, "name="))
+				if after, ok := strings.CutPrefix(f, "name="); ok {
+					client.Filters[action.IncludeNameFilter] = append(client.Filters[action.IncludeNameFilter], after)
 				} else if notName.MatchString(f) {
 					client.Filters[action.ExcludeNameFilter] = append(client.Filters[action.ExcludeNameFilter], notName.ReplaceAllLiteralString(f, ""))
 				}