Is `attachConfirmUserTrigger.sh` still needed?

I recently had issues with deploying a freshly cloned version of the chat example because of the following error:
```
Error: Command failed: ./scripts/attachConfirmUserTrigger.sh
./scripts/attachConfirmUserTrigger.sh: 8: ./scripts/attachConfirmUserTrigger.sh: Syntax error: "(" unexpected
```
When I dig in a little deeper, I see the following comment at the top of the offending script:
```
# This script is used until a bug regarding Cognito User Pools in serverless is fixed
# https://github.com/serverless/serverless/pull/3799
```
When I follow that link, I see that the PR has been merged and the related issues closed. Does that mean we can remove this script (along with its corresponding detach script)?