Possibility to add custom identity providers for the Cognito user pool client

[salemgolemugoo]

Description

It's needed if you want to integrate your Cognito pool with some 3rd party identity provider

Changes

Introduced a new parameter for the CloudFormation template

How Has This Been Tested?

Deployed from scratch with a custom parameter value

References

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cognito-userpoolclient.html#cfn-cognito-userpoolclient-supportedidentityproviders

PR Quality Checklist

• I added tests to new or existing code
• I removed hardcoded strings and used react-i18next library (useTranslation hook and/or Trans component), see an example here
• I made sure no sensitive info gets logged at any time in the codebase (see here) (e.g. no user info or details, no stacktraces, etc.)
• I made sure that any GitHub issue solved by this PR is correctly linked
• I checked that infrastructure/update_infrastructure.sh runs without any error
• I checked that npm run build builds without any error
• I checked that clusters are listed correctly
• I checked that a new cluster can be created (config is produced and dry run passes)
• I checked that login and logout work as expected

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