fix(grid-state): prevent getState from mutating sorting/filtering/groupBy expressions

Co-authored-by: ivanvpetrov <110455887+ivanvpetrov@users.noreply.github.com>
Agent-Logs-Url: https://github.com/IgniteUI/igniteui-angular/sessions/e64a2fe5-4a21-449b-a683-9b3871e36395

Author: Copilot