Pk missing fix (#2107)

* fix partition key missing not being able to load the document

* Implement E2E tests for documents with different partitionkeys

* Implement E2E tests for documents with different partitionkeys

* Implement E2E tests for documents with different partitionkeys

* Updated snapshot

* Updated tests for MongoRU and add create/delete tests

* Fixing system partition key showing up in Data Explorer

test/mongo/testCases.ts

@@ -0,0 +1,31 @@
+import { DocumentTestCase } from "../testData";
+
+export const documentTestCases: DocumentTestCase[] = [
+  {
+    name: "Unsharded Collection",
+    databaseId: "e2etests-mongo-readonly",
+    containerId: "unsharded",
+    documents: [
+      {
+        documentId: "unsharded",
+        partitionKeys: [],
+      },
+    ],
+  },
+  {
+    name: "Sharded Collection",
+    databaseId: "e2etests-mongo-readonly",
+    containerId: "sharded",
+    documents: [
+      {
+        documentId: "sharded",
+        partitionKeys: [
+          {
+            key: "/shardKey",
+            value: "shardKey",
+          },
+        ],
+      },
+    ],
+  },
+];