LYN-4327 [SDK] External Gem's aren't added to the project solution when using SDK (#1191)

* should pickup the external directories registered by the project

* Add support for AzTest and AzTestRunner in the SDK

* missing IMPORT_LIB

* Moved where .Assets targets get generated so they are visible in the SDK

* generate the Directory.Build.props in the right path

* excluding target on platforms that dont support it

scripts/ctest/CMakeLists.txt

@@ -16,35 +16,6 @@ if(NOT PAL_TRAIT_BUILD_TESTS_SUPPORTED)
     return()
 endif()
 
-################################################################################
-# Asset Processing Target
-# i.e. Tests depend on AutomatedTesting.Assets
-################################################################################
-
-if(PAL_TRAIT_BUILD_TESTS_SUPPORTED AND PAL_TRAIT_BUILD_HOST_TOOLS)
-    get_property(LY_PROJECTS_TARGET_NAME GLOBAL PROPERTY LY_PROJECTS_TARGET_NAME)
-    foreach(project_target_name project_path IN ZIP_LISTS LY_PROJECTS_TARGET_NAME LY_PROJECTS)
-        file(REAL_PATH ${project_path} project_real_path BASE_DIRECTORY ${LY_ROOT_FOLDER})
-        # With the lock file, asset processing jobs are serialized to avoid race conditions
-        # on files that are created temporarily in source folders during shader processing.
-        add_custom_target(${project_target_name}.Assets
-            COMMENT "Processing ${project_target_name} assets..."
-            COMMAND "${CMAKE_COMMAND}" 
-                -DLY_LOCK_FILE=$<TARGET_FILE_DIR:AZ::AssetProcessorBatch>/project_assets.lock
-                -P ${LY_ROOT_FOLDER}/cmake/CommandExecution.cmake
-                    EXEC_COMMAND $<TARGET_FILE:AZ::AssetProcessorBatch> 
-                        --zeroAnalysisMode 
-                        --project-path=${project_real_path} 
-                        --platforms=${LY_ASSET_DEPLOY_ASSET_TYPE}
-        )
-        set_target_properties(${project_target_name}.Assets
-            PROPERTIES 
-                EXCLUDE_FROM_ALL TRUE
-                FOLDER ${project_target_name}
-        )
-    endforeach()
-endif()
-
 ################################################################################
 # Tests
 ################################################################################