chore: remove remaining references

Author: durran

global.d.ts

@@ -16,7 +16,6 @@ declare global {
        * of mongodb-client-encryption.  Ex: `clientSideEncryption: '>=6.0.1'`
        */
       clientSideEncryption?: string | true;
-      serverless?: 'forbid' | 'allow' | 'require';
       auth?: 'enabled' | 'disabled';
       idmsMockServer?: true;
       nodejs?: string;

test/integration/client-side-operations-timeout/unified-csot-node-specs/command-execution.json

@@ -8,8 +8,7 @@
         "single",
         "replicaset",
         "sharded"
-      ],
-      "serverless": "forbid"
+      ]
     }
   ],
   "createEntities": [