[web] introduce UserProfileActionButtons

Summary:
Based on the designs, the action buttons for the user profiles on web are going to be rendered pretty differently based on what the user relationship status is. In an effort to not oversaturate UserProfile, I am going to create this separate component that UserProfiles can call and render

For context:

Part of https://linear.app/comm/issue/ENG-4967/introduceport-userprofilerelationshipbutton

Depends on D9412

Test Plan: flow and confirmed that there were no regressions with user profiles on web.

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9431