chore: Refactor setConflictHandler to avoid directly exporting let #4586

Job	Run time
prebuild	3m 16s
github-actions-test / Github Action format test	29s
license-test / License tests	30s
tsc-compliance-test / TSC Compliance Test	36s
bundle-size-tests / Bundle size tests	1m 35s
dependency-review / Dependency Review	8s
unit-tests / get-package-list / Get packages list	9s
unit-tests / Unit Test - @aws-amplify/adapter-nextjs	51s
unit-tests / Unit Test - @aws-amplify/analytics	1m 5s
unit-tests / Unit Test - @aws-amplify/api	47s
unit-tests / Unit Test - @aws-amplify/api-graphql	1m 6s
unit-tests / Unit Test - @aws-amplify/api-rest	44s
unit-tests / Unit Test - @aws-amplify/auth	2m 12s
unit-tests / Unit Test - aws-amplify	1m 8s
unit-tests / Unit Test - @aws-amplify/core	1m 28s
unit-tests / Unit Test - @aws-amplify/datastore	5m 5s
unit-tests / Unit Test - @aws-amplify/datastore-storage-adapter	1m 1s
unit-tests / Unit Test - @aws-amplify/geo	41s
unit-tests / Unit Test - @aws-amplify/interactions	54s
unit-tests / Unit Test - @aws-amplify/notifications	1m 17s
unit-tests / Unit Test - @aws-amplify/predictions	50s
unit-tests / Unit Test - @aws-amplify/pubsub	56s
unit-tests / Unit Test - @aws-amplify/react-native	27s
unit-tests / Unit Test - @aws-amplify/rtn-push-notification	48s
unit-tests / Unit Test - @aws-amplify/rtn-web-browser	25s
unit-tests / Unit Test - @aws-amplify/storage	1m 6s
Unit and Bundle tests have passed	1s
ci - Unit and Bundle tests have passed	1s
	29m 36s

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