[MOB-12204] Upgrade macOS Resource Class to Gen2 (#348)

Migrate `e2e_ios_captain` job's deprecated macOS large resource class machine to the new `macos.x86.medium.gen2`

Author: a7medev

.circleci/config.yml

@@ -147,7 +147,7 @@ jobs:
   e2e_ios_captain:
     macos:
       xcode: 13.4.1
-    resource_class: large
+    resource_class: macos.x86.medium.gen2
     steps:
       - checkout
       - setup_captain: