Project Manager Can Cancel Project Builds (#1694)

* Fixed misc building and project screen bugs, added ability to cancel active builds and queued builds

* Cancelling in-progress cmake build working

Signed-off-by: nggieber <nggieber@amazon.com>

Code/Tools/ProjectManager/Platform/Mac/ProjectBuilderWorker_mac.cpp

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) Contributors to the Open 3D Engine Project. For complete copyright and license terms please see the LICENSE at the root of this distribution.
+ * 
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
+
+#include <ProjectBuilderWorker.h>
+
+namespace O3DE::ProjectManager
+{
+    AZ::Outcome<void, QString> ProjectBuilderWorker::BuildProjectForPlatform()
+    {
+        QString error = tr("Automatic building on MacOS not currently supported!");
+        QStringToAZTracePrint(error);
+        return AZ::Failure(error);
+    }
+    
+} // namespace O3DE::ProjectManager