UX: restore shared sidebar link for posts and drafts (#31159)

While introducing the new drafts dropdown menu component, we also made
some changes to how the sidebar link works for Drafts. However, after
following user feedback and internal discussions we decided to revert
back to the shared link approach that combines My Posts and My Drafts.

config/locales/client.en.yml

@@ -4979,9 +4979,11 @@ en:
             users:
               content: "Users"
               title: "List of all users"
-            my_drafts:
-              content: "My Drafts"
-              title: "My unposted drafts"
+            my_posts:
+              content: "My Posts"
+              content_drafts: "My Drafts"
+              title: "My recent topic activity"
+              title_drafts: "My unposted drafts"
               draft_count:
                 one: "%{count} draft"
                 other: "%{count} drafts"