[web] make user profile accessible from user entity robotext

Summary:
This diff makes the user entity in the robotext interactive. When a user clicks on this component, the user profile modal will be pushed

Linear task: https://linear.app/comm/issue/ENG-5243/make-user-profile-accessible-from-a-user-entity-in-a-robotext

Depends on D9483

Test Plan:
Please see the demo video below

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9484