1. Add nullptr checks to prevent crashes when non-critical shaders fail to compile. (#5451)

2. Add a higher "launch_ap_timeout" for Mac because launching a newly built/downloaded AP can take a while.

Signed-off-by: amzn-sj <srikkant@amazon.com>

Gems/Atom/Feature/Common/Code/Source/ReflectionProbe/ReflectionProbeFeatureProcessor.cpp

@@ -443,7 +443,12 @@ namespace AZ
         {
             // load shader
             shader = RPI::LoadCriticalShader(filePath);
-            AZ_Error("ReflectionProbeFeatureProcessor", shader, "Failed to find asset for shader [%s]", filePath);
+
+            if (shader == nullptr)
+            {
+                AZ_Error("ReflectionProbeFeatureProcessor", false, "Failed to find asset for shader [%s]", filePath);
+                return;
+            }
 
             // store drawlist tag
             drawListTag = shader->GetDrawListTag();