Remove SMS and MFA Parameters

Signed-off-by: Sean Smith seaam@amazon.com

Description

This commit removes two old parameters EnableMFA, and AdminUserPhone that were used for SMS based MFA. Instead of this we advise users to setup MFA using an authenticator app following the instructions here.

TBD - wasn't sure how to test changes to the container image.

[ ] I added tests to new or existing code
[ ] 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
[ ] 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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