Add an option to revoke active sessions before user deletion

AWS Console added a feature into the User pane of IAM IdC that allows you to Revoke/Delete active sessions. This request is to add the ability (likely via a cmd flag) to revoke a users active sessions BEFORE disabling/deleting them.

Start by tracing the existing user disable/delete flow in the CLI and AWS Lambda entry points, then check the AWS IAM Identity Center session-revocation capability referenced in the issue. Add a command-line option that revokes active sessions before disabling or deleting users, and verify both user-removal paths perform the requested ordering.

Written by the indexing model from the issue text.