Add Rule::isRegularTarget(): boolean

[theofidry]

    /**
     * @return Rule
     */
    private static function getE2ETestRules(): array
    {
        return array_values(
            array_filter(
                self::getParsedRules(),
                static fn (Rule $rule) => str_starts_with($rule->getTarget(), '_test_e2e_') && !$rule->isComment() && !$rule->isPhony(),
            ),
        );
    }