[BUG] Reactions not cleared when user is deleted

[shurwit]

Describe the bug
Currently we are not handling reactions when we receive a request to clear user data from the system.

To Reproduce
Steps to reproduce the behavior:

1. Leave reaction on post
2. Call DELETE /api/user endpoint
3. See reaction is still there

Expected behavior
When we call the DELETE /api/user endpoint all user data should be cleared from the system, including reactions.