Fixed JSON validation, which was not taking order into account

More precisely, json data come from the JSONSink and this produces a list of non ordered items, one may call it a set.
Unfortunately JSON does not have such a concept so an ordered list is produced and the validator was naturally checking that the order was correct

GaudiPolicy/python/GaudiTesting/BaseTest.py

@@ -1511,6 +1511,11 @@ class JSONOutputValidator:
 
         # piggyback on TestCase dict diff report
         t = TestCase()
+        # sort both lists (these are list of entities) as the order is not supposed to matter
+        # indeed, the JSONSink implementation does not garantee any particular order
+        # but as JSON does not have sets, we get back a sorted list here
+        expected = sorted(expected, key=lambda item: (item["component"], item["name"]))
+        out = sorted(out, key=lambda item: (item["component"], item["name"]))
         try:
             t.assertEqual(expected, out)
         except AssertionError as err: