Revert "[PCUI]Add PermissionBoundary for every IAM role and prefix for every IAM role and policy. (#255)"

This reverts commit 6aaed036adae5ab1facab86fb9144207c2c7de03.

Reason: to merge any changes reliant on PC API, we need to do the following in order:

For this specific commit, we need to

Wait for ParallelCluster 3.8.0 release, because the PC API related change is in 3.8.0 https://github.com/aws/aws-parallelcluster/pull/5640
Bump version in PC UI to 3.8.0
Merge the changes

Description

[ ] 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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