Fix incremental download progress of workspaceiteminfos.

WorkspaceItemInfo intent package names could be null, while the item info itself had a non-null package name. Added a helper method checking component package names first, then intent package names as a fallback for deep shortcuts.

Demo: https://drive.google.com/file/d/1No44OD7SAD9qdmu-O6g3WaGdFjFLu2in/view?usp=sharing

Fixes: 181261930
Test: Manually on device
Change-Id: Ie2e10a79865b4898038fbdd4bbd9a7e9e1d42366