Get the issue type hierarchy for a next-gen project.
The issue type hierarchy for a project consists of:
- Epic at level 1 (optional).
- One or more issue types at level 0 such as Story, Task, or Bug. Where the issue type Epic is defined, these issue types are used to break down the content of an epic.
- Subtask at level -1 (optional). This issue type enables level 0 issue types to be broken down into components. Issues based on a level -1 issue type must have a parent issue.
required: Browse projects for the project.