[web] Fix spoiler animation for links

Summary:
Solution for ENG-4676

This diff fixes the issue where spoiler reveal animation was not applied to links.

Depends on D8875.

Test Plan:

1. Before applying this patch, check if current spoiler reveal animation doesn't work for links:

2. Apply this patch and see if animation works for links too:

Reviewers: tomek, inka, rohan

Reviewed By: inka, rohan

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8877