[Names] Show error messages when setting a name as an alias or a link fails

## 🎉 Description

When setting a name as an alias or a link fails, the user doesn't know the reason for the failure because there is never an error message on the screen.

* [ ] 🐛 This is a bug report.
* [x] 📈 This is a feature request.

## 📝 Details

Capture the sagas event `SET_PROFILE_AVATAR_ALIAS_FAILURE` and show an error notifying the user of the failure reason. This will improve the support and debugging process.