fix: Allow CICD pipeline to have cognito permission for creating root user

[nguyen102]

Issue #, if available:

Description of changesfix:

Allow CICD pipeline to have cognito permission for creating root user

Checklist:

• Have you successfully deployed to an AWS account with your changes?
• Have you written new tests for your core changes, as applicable?
• Have you successfully tested with your changes locally?
• If new dependencies have been added, have they been pinned to specific versions?
• Is this change also required on the AWS Solution version?
• Have you updated openapi.yaml if you made updates to API definition (including add, delete or update parameter and request data schema)?
• If you had to run manual tests, have you considered automating those tests by adding them to end-to-end tests?
• If you are updating the changelog and vending out a new release, have you updated versionNumber and versionDate in .defaults.yml

AS review ticket id:

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

[codecov]

Codecov Report

Merging #914 (df2a3f8) into develop (86c6e19) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #914   +/-   ##
========================================
  Coverage    51.71%   51.71%           
========================================
  Files          293      293           
  Lines        16597    16597           
  Branches      2569     2569           
========================================
  Hits          8583     8583           
  Misses        7046     7046           
  Partials       968      968           

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