Fix deployment for GovCloud region us-gov-west-1

Description

This PR addresses the deployment issue related to a Cost Explorer policy being deployed in GovCloud region. The fix is not deploy that specific part of the CostMonitoringAndPricingPolicy. NB: the name of the policy has been left unchanged since changing it right now doesn't provide much value.

This PR doesn't solve any issues since the fix needs to be addressed at code level also.

How Has This Been Tested?

manually in my personal account

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.)
[x] 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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aws / aws-parallelcluster-ui