Add support for `type in List` for work item types

Description

!87 (merged) added support for work item types using the type = Value expression where Value is one of Issue, Incident, Requirement, TestCase, Task, Ticket, Objective, KeyResult, Epic and MergeRequest.

We still do not support type in List, which this issue tracks. The key change needed here is to support list for work item types only, excluding MergeRequest (or any other future types like Vulnerability we add in the future).