fix(cognito-identitypool-alpha): inconvenient IdentityPoolProviderUrl.userPool()

[Tietew]

Reason for this change

IdentityPoolProviderUrl.userPool() requires a string url currently. The description is "User Pool Provider Url". It should be `${userPool.userPoolProviderName}:${userPoolClient.userPoolClientId}`.

UserPool has an attribute userPoolProviderUrl which description is "User Pool Provider Url", but confusingly, it cannot be specified to IdentityPoolProviderUrl.userPool().

The format of the identity provider identifier isn't well documented. See SetIdentityPoolRoles API reference for example of User Pool's identity provider identifier.

Description of changes

This PR fixes IdentityPoolProviderUrl.userPool() to accept UserPool and UserPoolClient instead of a string url. It generates a correct identifier described above.

Description of how you validated changes

Existing integration test generates an identifier as described above. The snapshot won't be changed by this PR.

Checklist

• [x] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

BREAKING CHANGE: The argument of IdentityPoolProviderUrl.userPool() has been changed from url: string to userPool: UserPool, userPoolClient: UserPoolClient. If you want to specify custom identifier string, use IdentityPoolProviderUrl.custom() instead.

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

[Tietew]

Exemption Request The snapshot should not be changed.

[Tietew]

Updated BREAKING CHANGE in description

[aws-cdk-automation]

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[aws-cdk-automation]

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[TheRealAmazonKendra]

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[mergify[bot]]

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: d90abe298332514aade2eb850366ed2324c176ef
• Result: SUCCEEDED
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[mergify[bot]]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).