Deprecating ` users self` GET route

Description

Delete /users/self GET endpoint create a new endpoint with a more meaningful name and serve user's data on that endpoint.

---

Possible solutions

• We can use /users resource with a query param(id) like /users?id=some_id.
• We can replace /self with other names like /users/me or /users/profile.

---

Links

TCR, GitHub Issue, and Design doc.