If two test cases had the same name but came from a different
executable the results pane still might have shown any later one
(badly) cascaded inside the first one. Avoid this by providing
an additional unique information (the respective executable for
the test case)

Task-number: QTCREATORBUG-18502
Change-Id: Ib071e389758b6269a9a90cc4c4afbcf86ca583ac
Reviewed-by: David Schulz <david.schulz@qt.io>