chore(executeOperation): use owner symbol instead of owner obj

Author: daprahamian

.eslintrc

@@ -8,7 +8,8 @@
   },
   "globals": {
     "Promise": true,
-    "Set": true
+    "Set": true,
+    "Symbol": true
   },
   "parserOptions": {
     "ecmaVersion": 2017

lib/utils.js

@@ -382,7 +382,7 @@ const executeOperation = (topology, operation, args, options) => {
   if (!options.skipSessions && topology.hasSessionSupport()) {
     opOptions = args[args.length - 2];
     if (opOptions == null || opOptions.session == null) {
-      owner = {};
+      owner = Symbol();
       session = topology.startSession({ owner });
       const optionsIndex = args.length - 2;
       args[optionsIndex] = Object.assign({}, args[optionsIndex], { session: session });