Remove deleted projects from project manager

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

Code/Tools/ProjectManager/Source/ProjectsScreen.cpp

@@ -119,6 +119,8 @@ namespace O3DE::ProjectManager
 
     QFrame* ProjectsScreen::CreateProjectsContent(QString buildProjectPath, ProjectButton** projectButton)
     {
+        RemoveInvalidProjects();
+
         QFrame* frame = new QFrame(this);
         frame->setObjectName("projectsContent");
         {
@@ -481,6 +483,11 @@ namespace O3DE::ProjectManager
         return displayFirstTimeContent;
     }
 
+    void ProjectsScreen::RemoveInvalidProjects()
+    {
+        PythonBindingsInterface::Get()->RemoveInvalidProjects();
+    }
+
     void ProjectsScreen::StartProjectBuild(const ProjectInfo& projectInfo)
     {
         if (ProjectUtils::IsVS2019Installed())