Add-ons Report Improvements by Xon 2.20.3

• Fix "Call to undefined method XF\Entity\User::canReportSearch()" that can occur during upgrading
• When a post is being reported; inject 'user has been warned for this post' notice, and a 'has been reply-banned' notice if SV/ThreadReplyBanTeeth add-on is installed

• On making non-closing report comments; do not record a comment as sent if the 'send alert' checkbox is set, despite not actually sending the alert

• On making non-closing report comments; do not record a comment as sent if the 'send alert' checkbox is set, despite not actually sending the alert