Remove duplicated API from container contract

[AnnaShaleva]

Method

neofs-contract/container/container_contract.go

Line 435 in dc89137

func List(owner []byte) [][]byte {

returns the list of all container IDs owned by the specified user. In case of the nil user it iterates over the whole container list, which can easily exceed the MaxStackSize (2048) constraint.
We have

neofs-contract/container/container_contract.go

Line 425 in dc89137

func ContainersOf(owner []byte) iterator.Iterator {

introduced in #300 that returns the same result in the form of iterator, so we'd better remove List at all (or at least forbid empty owner parameter for this method).

Ref. #304.

[roman-khimov]

It's needed for compatibility reasons for now. This can be done in future, when we have all users of it migrated.