This changes `createDataObject()` to pass `skipSelect: true` for objects
other than items. If a test is creating a bunch of collections, there's
no reason for each one to be selected and for an items list to start to
load. If a test does need a new collection or search to be selected, it
can call the new convenience function `await select(win, obj)`, which
will select the passed object in the collection tree and wait for its
items list to load. I'm hoping this reduces random test failures due to
items list churn.
When the associated-files pref is enabled, Add Item by Identifier uses a
Zotero Unpaywall mirror to find available open-access PDFs. No details
about the contents of searches are logged.
