[API][Zone] Zone API tests

[Zales0123]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Related tickets
License	MIT

[lchrusciel]

👍 Can be added in separate PR, but we can think about some custom validation, like what would happen if we sent some strange type during creation.

[pjedrzejewski]

Thanks Mateusz! We need to remove the type from the endpoints in the next iteration. It should use a form type that has "type" field enabled. Then the type can be passed as part of the request content and not in the url.

[Zales0123]

@pjedrzejewski I've thought about it, but it also require some changes about zone members collection (now it takes 'zone_type' => $zoneType option). Nevertheless - 👍