ATOM-15451 always bring material editor and foreground when launching

Bus, command line option, and handler to activate material editor window
Made sure that material editor action in Ly tools menu is not checked/checkable
Ly editor pushes command line option to use the same RHI

https://jira.agscollab.com/browse/LYN-2610
https://jira.agscollab.com/browse/ATOM-15451
https://jira.agscollab.com/browse/ATOM-13742

Gems/Atom/Tools/MaterialEditor/Code/Source/MaterialEditorApplication.cpp

@@ -45,6 +45,7 @@
 
 #include <Atom/Window/MaterialEditorWindowModule.h>
 #include <Atom/Window/MaterialEditorWindowFactoryRequestBus.h>
+#include <Atom/Window/MaterialEditorWindowRequestBus.h>
 #include <AzCore/Utils/Utils.h>
 
 AZ_PUSH_DISABLE_WARNING(4251 4800, "-Wunknown-warning-option") // disable warnings spawned by QT
@@ -309,6 +310,13 @@ namespace MaterialEditor
 
     void MaterialEditorApplication::ProcessCommandLine(const AZ::CommandLine& commandLine)
     {
+        const AZStd::string activateWindowSwitchName = "activatewindow";
+        if (commandLine.HasSwitch(activateWindowSwitchName))
+        {
+            MaterialEditor::MaterialEditorWindowRequestBus::Broadcast(
+                &MaterialEditor::MaterialEditorWindowRequestBus::Handler::ActivateWindow);
+        }
+
         const AZStd::string timeoputSwitchName = "timeout";
         if (commandLine.HasSwitch(timeoputSwitchName))
         {
@@ -438,6 +446,10 @@ namespace MaterialEditor
             // Handle commmand line params from connected socket
             if (buffer.startsWith("ProcessCommandLine:"))
             {
+                // Bring the material editor to the foreground
+                MaterialEditor::MaterialEditorWindowRequestBus::Broadcast(
+                    &MaterialEditor::MaterialEditorWindowRequestBus::Handler::ActivateWindow);
+
                 // Remove header and parse commands
                 AZStd::string params(buffer.data(), buffer.size());
                 params = params.substr(strlen("ProcessCommandLine:"));