Temporarily disable alert_words markdown processor on staging

(imported from commit ab3eed4ce36ebcd3d928d2d92fc34c9ebacc11f9)

zerver/lib/bugdown/__init__.py

@@ -612,6 +612,8 @@ class Bugdown(markdown.Extension):
                   'strong'):
             del md.inlinePatterns[k]
 
+        # Temporarily disable alert words on staging to help track down postgres transation quirkiness
+        if not settings.STAGING_DEPLOYED:
             md.preprocessors.add("custom_text_notifications", AlertWordsNotificationProcessor(md), "_end")
 
         # Custom bold syntax: **foo** but not __foo__