Skip ends the test (albeit inconclusively). Rearrange the enums in
the abstract logger, move code to handle skip between relevant
function and tidy up various things that became simpler as a result.
Also reorder the message enum, and its switches, to separate testlib's
internals from the usual Qt messages, and put each group in ascending
order of severity.
Task-number: QTBUG-96844
Change-Id: I2c7a634b9f849830d64eafa750155e66e244b729
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
77a93e6df3