fix: integration test

[zixiang2018]

What this PR does

1. fix npm run integration:local
2. fix npm run e2e:local
3. use .env variables in email sls
4. update .env.example's bucket name to match storage's serverless default BUCKET_NAME
5. standardize .js files with handler to use ESM exporting - export const handler = middy()...
6. standardize all .js files handler to remove callback; use async/await (recommended by https://docs.aws.amazon.com/lambda/latest/dg/nodejs-handler.html)
7. turn off import/prefer-default-export in eslintrc for (5) to work
8. turn off prefer-regex-literals for test/utils/matcher.js

Pipeline

• Refer to this https://console.seed.run/openattestation/opencerts-functions/activity/stages/pr148/

[seed-deploy]

View stack outputs

• mail-pr148

  Name	Value
  ServiceEndpoint	https://5rxdoz5pf0.execute-api.ap-southeast-1.amazonaws.com/pr148

• storage-pr148

  Name	Value
  ServiceEndpoint	https://kgsr1zv82f.execute-api.ap-southeast-1.amazonaws.com/pr148

• verify-pr148

  Name	Value
  ServiceEndpoint	https://yuchcpine8.execute-api.ap-southeast-1.amazonaws.com/pr148