[chore] Doubling the instance size used for CI (#20889)

* [chore] Doubling the instance size used for CI

This is to compensate for increased memory usage for DB Tests running with -race

.circleci/config.yml

@@ -7,7 +7,7 @@ orbs:
 executors:
   ubuntu:
     working_directory: ~/mattermost/
-    resource_class: xlarge
+    resource_class: 2xlarge
     machine:
       image: "ubuntu-2004:202201-02"
     environment: