Make withoutRequestValidation() and withoutResponseValidation() attributes

[krzysztofrewak]

Using $this->withoutRequestValidation() and $this->withoutResponseValidation() makes tests harder to read. If we could do something like this, it would be a nice thing:

    #[WithoutRequestValidation]
    public function testFailsToChangeThePasswordForUserWithoutPasswordSetUp(): void
    {
        $currentPassword = null;