test: add api version when creating new test client (#3253)

Author: durran

test/tools/runner/config.ts

@@ -198,6 +198,10 @@ export class TestConfiguration {
       dbOptions.loadBalanced = true;
     }
 
+    if (process.env.MONGODB_API_VERSION) {
+      dbOptions.apiVersion = process.env.MONGODB_API_VERSION;
+    }
+
     const urlOptions: url.UrlObject = {
       protocol: 'mongodb',
       slashes: true,