REPO-5191 Bug: T-Engine should provide mapping rather than the repo. (#316)

Bug found while reviewing documents on how to create a custom metadata extractor. The original refactor had left the repo doing the mapping. It should have been passing the fully qualified repo properties to the T-Engine to do the mapping.

Linked to:
    Alfresco/alfresco-community-repo#227
    Alfresco/acs-packaging#1826

alfresco-transform-core-aio/alfresco-transform-core-aio-boot/src/test/java/org/alfresco/transformer/AIOControllerTikaTest.java

@@ -75,7 +75,7 @@ public class AIOControllerTikaTest extends TikaControllerTest
         // Ignore the test in super class as the way the AIO transformer provides config is fundamentally different.
 
     }
-    
+
     @Test
     @Override
     public void testGetInfoFromConfigWithNoTransformOptions()
@@ -83,4 +83,12 @@ public class AIOControllerTikaTest extends TikaControllerTest
         // Ignore the test in super class as the way the AIO transformer provides config is fundamentally different.
 
     }
+
+    @Test
+    @Override
+    public void xlsxEmbedTest()
+    {
+        // Ignore the test in super class as the way the AIO transformer provides config is fundamentally different.
+        // It uses the real class path rather than the test one.
+    }
 }

alfresco-transform-core-aio/alfresco-transform-core-aio/src/test/resources/tika_engine_config.json

@@ -13,6 +13,10 @@
     ],
     "metadataOptions": [
       {"value": {"name": "extractMapping"}}
+    ],
+    "metadataEmbedOptions": [
+      {"value": {"name": "metadata", "required": true}},
+      {"value": {"name": "targetEncoding"}}
     ]
   },
   "transformers": [
@@ -981,6 +985,15 @@
       "transformOptions": [
         "metadataOptions"
       ]
+    },
+    {
+      "transformerName": "SamplePoiMetadataEmbedder",
+      "supportedSourceAndTargetList": [
+        {"sourceMediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",          "targetMediaType": "alfresco-metadata-embed"}
+      ],
+      "transformOptions": [
+        "metadataEmbedOptions"
+      ]
     }
   ]
 }