Improve TraceWarningPackageSync (DEV, EXPOSUREAPP-6270) (#2782)

* Improve logging.

* Use the correct lower bound for package downloads.

* Adjust empty package check.

* Improve logging

* Improve logging

* Report failed calculation downloads fail.

* Improve logging.

* Check and delete local files for pkgs marked as empty.

* When determining which files to download, only match against known ones that actually have the state "isDownloaded", otherwise try to download again.

* Add unit test for failed downloads

* Fix logging arguments.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>