Add Support for Displaying Custom.Group in the Release Plan App

**Requirement:**
For Java v2 packages, we will use a new `groupId` while keeping existing package name (e.g. using `com.azure.v2`). User should be able to select the package name along with the group name while releasing a package.

**Task:**
As discussed with @praveenkuttappan, we've added a new field to the release dev-ops work items, i.e. `Custom.GroupId`. This task is to update the `release plan app` to display the `GroupId` value together with the `package name`, ensuring users can clearly identify the correct `group/package` combination during release.

Locate the release plan app and find where package names from release DevOps work items are displayed. Inspect how the Custom.GroupId field is read, then verify that the UI shows the GroupId together with the package name so users can identify the correct group/package combination.

Written by the indexing model from the issue text.