https://github.com/Azure/azure-sdk-tools/blob/6e6038ab75feb6b557b0ed360b94ba5413e33ff9/eng/common/scripts/Helpers/DevOps-WorkItem-Helpers.ps1#L599C1-L620C2
- Find or create a parent work item for a package group associated with a particular service. It is used by the
CreateOrUpdatePackageWorkItem method.
-This method ensures that each package group has a parent "Epic" under which related releases or sub items can be tracked.
- Params:
- service name: service name the package group belongs to.
- package display name: package name
- tag: an identifying tag
- ignore release planner tests: Filters out tag 'release planner app test'
