AutoTest: Add automatic run after build

Add an option to automatically run tests if the build
succeeded and the current project has tests.

Change-Id: I1fe028be84279b9b488f78590565c6d4b0449e34
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/autotest/autotestconstants.h

@@ -53,10 +53,12 @@ const char SK_USE_GLOBAL[]              = "AutoTest.UseGlobal";
 namespace Internal {
 enum class TestRunMode
 {
+    None,
     Run,
     RunWithoutDeploy,
     Debug,
-    DebugWithoutDeploy
+    DebugWithoutDeploy,
+    RunAfterBuild
 };
 } // namespace Internal
 } // namespace Autotest