AutoTest: Disable timeout by default

Usually test frameworks or tools have their own timeout
handling or not at all.
Let the user decide whether to use a timeout or not.
This is a behavior change as now the test run does not
get automatically canceled anymore except when the user
explicitly enables this feature.

Fixes: QTCREATORBUG-30668
Change-Id: Ic5d98db0c52bfea092e427d317b12c41d6484ad0
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/testsettings.h

@@ -31,6 +31,7 @@ public:
     void fromSettings();
 
     Utils::IntegerAspect scanThreadLimit{this};
+    Utils::BoolAspect useTimeout{this};
     Utils::IntegerAspect timeout{this};
     Utils::BoolAspect omitInternalMsg{this};
     Utils::BoolAspect omitRunConfigWarn{this};