Sync unified-test-format tests

Author: alcaeus

tests/UnifiedSpecTests/valid-pass/poc-change-streams.json

@@ -103,6 +103,9 @@
         {
           "name": "createChangeStream",
           "object": "client0",
+          "arguments": {
+            "pipeline": []
+          },
           "saveResultAsEntity": "changeStream0"
         },
         {
@@ -246,7 +249,8 @@
           "name": "createChangeStream",
           "object": "collection0",
           "arguments": {
-            "batchSize": 1
+            "batchSize": 1,
+            "pipeline": []
           },
           "saveResultAsEntity": "changeStream0"
         },

tests/UnifiedSpecTests/valid-pass/poc-gridfs.json

@@ -240,7 +240,9 @@
               "uploadDate": {
                 "$$type": "date"
               },
-              "md5": "283d4fea5dded59cf837d3047328f5af",
+              "md5": {
+                "$$unsetOrMatches": "283d4fea5dded59cf837d3047328f5af"
+              },
               "filename": "filename"
             }
           ]

tests/UnifiedSpecTests/valid-pass/poc-retryable-writes.json

@@ -297,11 +297,15 @@
             "ordered": true
           },
           "expectResult": {
-            "insertedCount": 2,
-            "insertedIds": {
-              "$$unsetOrMatches": {
-                "0": 3,
-                "1": 4
+            "$$unsetOrMatches": {
+              "insertedCount": {
+                "$$unsetOrMatches": 2
+              },
+              "insertedIds": {
+                "$$unsetOrMatches": {
+                  "0": 3,
+                  "1": 4
+                }
               }
             }
           }