DEV: Correct typos and spelling mistakes (#12812)

Over the years we accrued many spelling mistakes in the code base. 

This PR attempts to fix spelling mistakes and typos in all areas of the code that are extremely safe to change 

- comments
- test descriptions
- other low risk areas

lib/badge_queries.rb

@@ -93,7 +93,7 @@ module BadgeQueries
     JOIN post_actions pa1 on pa1.id = x.id
   SQL
 
-  # Incorrect, but good enough - (earlies post edited vs first edit)
+  # Incorrect, but good enough - (earliest post edited vs first edit)
   Editor = <<~SQL
     SELECT p.user_id, min(p.id) post_id, min(p.created_at) granted_at
     FROM badge_posts p