Replace HelpTooltip in custom AMI selection

Description

Following https://github.com/aws-samples/pcluster-manager/pull/419 and https://github.com/aws-samples/pcluster-manager/pull/420, this PR is the first step towards replacing all instances of HelpTooltip with useHelpPanel() hook calls in order to be compliant with the CloudScape help system.

This PR fixes also the link in the footer of TitleDescriptionHelpPanel which was not opening a new tab when clicked.

Manually clicked on new info link and verified that help panel is opened and filled as expected

[ ] I added tests to new or existing code
[x] I removed hardcoded strings and used our i18n solution instead (see 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
[x] I checked that npm run build builds without any error
[x] 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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