Bugfix: In case of unarchival, do not add an installer task to add workspace item.

* In case install queue is cleared (which happens when launcher comes back to foregorund from background) when app has successfully unarchived, since app is not archived anymore, `AddWorkspaceItemTask` successfully manages to add item to the workspace.
* We should avoid adding pending task for adding workspace item in the queue at all for unarchival to prevent this.

Test: verified bugfixes locally.
Bug: 326495267
Flag: ACONFIG com.android.launcher3.enable_support_for_archiving DEVELOPMENT
Change-Id: Iae6d6390d8e2d9b270f7aef0dce1fa32d9899f28