Allow `current_user` and `can?` for UserProfile::Panel

What does this MR do and why?

Fixes #410983 (closed).

Allow current_user and can? for UserProfile::Panel. Otherwise, for unconfirmed (bot) users, the call to user_display_name failed.

Screenshots or screen recordings

How to set up and validate locally

Go to http://gdk.test:3000/alert-bot

MR acceptance checklist

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