Add a way to see a list of subscribed things (projects, issues, MRs, etc.) in profile
Description
Currently, there is no way to see a list of things I have subscribed as a user (projects, issues, MRs, etc.).
Proposal
There should be a link to see a list of subscribed items in the /username
page. That way, it's easy to go back and see all the items I want to watch and revisit. Especially, subscribed issues and merge requests.
Use cases
As a user, I would like to be able to easily see the items I've subscribed to in my profile view, so that I can take further action later.