Migrate to Work Items API

[go2null]

GitLab is deprecating the Epics REST API, and moving to a new Work Items GraphQL API.

• https://docs.gitlab.com/api/graphql/epic_work_items_api_migration_guide/

For new features (such as assignees, health status, linked items with other types), you must use the WorkItem GraphQL API.
[REST API] Does not receive new features.

As it currently stands, the REST API is becoming less and less useful with each new release. For example, Custom Fields are not exposed.

There was an earlier question, back in 2023, about supporting the GraphQL API.

• Would we like to include GraphQL API capabilities? #659

Is there a plan to support it sometime in the future, possibly wrapping the graphql-client gem like how gitlab-triage does?