fix: lint script to emit error

[AaronZyLee]

trafficstars

Description of changes

Fix the issue of lint error not emitting

CDK / CloudFormation Parameters Changed

Issue #, if available

Description of how you validated changes

Checklist

• [x] PR description included
• [x] yarn test passes
• [ ] Tests are changed or added
• [ ] Relevant documentation is changed or added (and PR referenced)
• [ ] New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies
• [ ] Any CDK or CloudFormation parameter changes are called out explicitly

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dpilch]

I've tested this with a couple of open PRs.

1. Has JS/TS files to lint: curl -fsSL https://api.github.com/repos/aws-amplify/amplify-category-api/pulls/2666/files | jq -r '.[] | select(.status!="removed") | .filename' | grep -E '\.(js|jsx|ts|tsx)$' | xargs yarn eslint || true
2. Does not have JS/TS files to lint: curl -fsSL https://api.github.com/repos/aws-amplify/amplify-category-api/pulls/1665/files | jq -r '.[] | select(.status!="removed") | .filename' | grep -E '\.(js|jsx|ts|tsx)$' | xargs yarn eslint || true