Fix link on messages sent to users

[#62124028]
Update /prefs/wikiaccount to handle users without validated email

[#62124028]
Do not hide wiki account prefs tab for users without validated email

(We have a better workflow in place for those users now.)

[#62124028]
Merge branch 'wiki_account_errors_62124028'
Merge branch 'master' into staging
Merge branch 'staging' into stable