feat(auth): Add identityPoolEndpoint config to allow using a custom CognitoIdentity endpoint #6098

Job	Run time
prebuild	3m 11s
bundle-size-tests / Bundle size tests	1m 47s
license-test / License tests	29s
tsc-compliance-test / TSC Compliance Test	42s
github-actions-test / Github Action format test	28s
dependency-review / Dependency Review	6s
unit-tests / get-package-list / Get packages list	12s
unit-tests / Unit Test - @aws-amplify/adapter-nextjs	52s
unit-tests / Unit Test - @aws-amplify/analytics	57s
unit-tests / Unit Test - @aws-amplify/api	51s
unit-tests / Unit Test - @aws-amplify/api-graphql	57s
unit-tests / Unit Test - @aws-amplify/api-rest	44s
unit-tests / Unit Test - @aws-amplify/auth	2m 3s
unit-tests / Unit Test - aws-amplify	1m 0s
unit-tests / Unit Test - @aws-amplify/core	1m 25s
unit-tests / Unit Test - @aws-amplify/datastore	3m 51s
unit-tests / Unit Test - @aws-amplify/datastore-storage-adapter	56s
unit-tests / Unit Test - @aws-amplify/geo	52s
unit-tests / Unit Test - @aws-amplify/interactions	53s
unit-tests / Unit Test - @aws-amplify/notifications	1m 11s
unit-tests / Unit Test - @aws-amplify/predictions	50s
unit-tests / Unit Test - @aws-amplify/pubsub	50s
unit-tests / Unit Test - @aws-amplify/react-native	43s
unit-tests / Unit Test - @aws-amplify/rtn-push-notification	37s
unit-tests / Unit Test - @aws-amplify/rtn-web-browser	29s
unit-tests / Unit Test - @aws-amplify/storage	1m 8s
Unit and Bundle tests have passed	0s
ci - Unit and Bundle tests have passed	1s
	28m 5s

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