Fix: [AEA-0000] - Temporarily Remove Document Notification (#396)

## Summary

Removes the slack notification when documents are updated.

With a AWS Simple Queue Service (SQS), only one Lambda can successfully
pick up a message, meaning EITHER this will run OR the sync will run -
which is counter-intuitive.

This will be removed while
[D298](https://nhsd-confluence.digital.nhs.uk/spaces/APIMC/pages/1305328394/D298+Knowledge-base+Document+Change+Notifications)
is being considered.

Author: kieran-wilkinson-4

packages/cdk/resources/S3LambdaNotification.ts

@@ -27,7 +27,9 @@ export class S3LambdaNotification extends Construct {
       queueName: queueName,
       batchDelay: 100,
       functions: [
-        props.functions.notifyS3UploadFunction,
+        // Temporarily only trigger sync, as only one can run at once on SQS
+        //    - if notifications is successful, sync won't run
+        // props.functions.notifyS3UploadFunction,
         props.functions.syncKnowledgeBaseFunction
       ]
     })