Fix broken reset password link

[tmscarla]

Description

Currently the workflow to reset the password of a Cognito user within PCUI is broken, since the reset code does not arrive to the specified email. The issue is rooted in the fact that users that belong to the PCUI Cognito user pool have the email_verified attribute set to False by default.

This PR aims at solving the aforementioned issue by setting email_verified to True in Cognito user pool both for admin user and new users.

Closes #35.

How Has This Been Tested?

• User creation has been tested on local environment, with a Cognito user pool deployed in my personal account
• Admin user has been tested by uploading parallelcluster-ui-cognito.yaml template on S3 in my personal account, and testing a full deployment of PCUI
• Verified that for both users reset password link works and email is received

References

• https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/cognito-idp.html#CognitoIdentityProvider.Client.admin_create_user
• https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cognito-userpooluser.html#cfn-cognito-userpooluser-userattributes

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 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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