REPO-5188 SourceEncoding should not be used to select transforms as i… (#249)

* REPO-5188 SourceEncoding should not be used to select transforms as it is always provided to T-Engines

* Fix test. Now that SourceEncoding is in the options but is not used to select the transformer, we need to add another
option to force the use of the textToPdf transform rather than libreoffice.

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

@@ -98,7 +98,7 @@ public class AIOTransformRegistryTest
                 "Archive", "OutlookMsg", "PdfBox", "Office", "Poi", "OOXML", "TikaAuto", "TextMining");
 
         List<String> expectedTransformOptionNames = Arrays.asList("tikaOptions", "archiveOptions", "pdfboxOptions",
-                "textToPdfOptions", "stringOptions", "htmlOptions");
+                "textToPdfOptions", "stringOptions");
 
         TransformConfig miscConfig = loadConfig("misc_engine_config.json");
         TransformConfig tikaConfig = loadConfig("tika_engine_config.json");

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

@@ -1,15 +1,10 @@
 {
   "transformOptions": {
     "textToPdfOptions": [
-      {"value": {"name": "pageLimit"}},
-      {"value": {"name": "sourceEncoding"}}
+      {"value": {"name": "pageLimit"}}
     ],
     "stringOptions": [
-      {"value": {"name": "sourceEncoding"}},
       {"value": {"name": "targetEncoding"}}
-    ],
-    "htmlOptions": [
-      {"value": {"name": "sourceEncoding"}}
     ]
   },
   "transformers": [
@@ -19,7 +14,6 @@
         {"sourceMediaType": "text/html",                                     "targetMediaType": "text/plain"}
       ],
       "transformOptions": [
-        "htmlOptions"
       ]
     },
     {