Replaced with Project explorer in most places and Progress view where
test expected no custom properties contribution.

Change-Id: Ie46c3776da32400b43665128f5d60ba8e1bd2b83
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ui/+/184157