Feature request description

When a user is sent a password reset link, the link navigates to a form that doesn't display a username, after submitting the password reset form they are redirected to the Sourcegraph instances login screen, however, the new login screen is unpopulated. The login page should auto populate the form with the correct username, and the initial reset link page should indicate the user whose password is being rest.

Heres an example of the current flow

Is your feature request related to a problem? If so, please describe.

This can be confusing when users aren't quite sure what username their account is being generated with. Its easy to forget as an admin to provide this information to new users

Describe alternatives you've considered.

The login page should auto populate the form with the correct username, and the initial reset link page should indicate the user whose password is being rest.

Additional context