Change account deletion page to have better explanations (#11753)

Fix deletion of unconfirmed account not freeing up the username

Add prefill of logged-in user's email in the reconfirmation form

app/services/suspend_account_service.rb

@@ -61,6 +61,7 @@ class SuspendAccountService < BaseService
     return if !@account.local? || @account.user.nil?
 
     if @options[:including_user]
+      @options[:destroy] = true if !@account.user_confirmed? || @account.user_pending?
       @account.user.destroy
     else
       @account.user.disable!