Refactor Workspace Loading / Processing code.

There are no behavioral changes (other than we no longer are recycling
objects while processing workspace items), but this refactor will setup
the next change to load the first workspace page before other workspace
pages.

Bug: 251502424
Test: Workspace, app widgets, and containers loaded properly.
Change-Id: I437aab40000d841d7fcc4380d05ab4a8f5d5c2ad