feat(curriculum): add fcc forum leaderboard lab to FSD cert (#57336)

Co-authored-by: Zaira <33151350+zairahira@users.noreply.github.com>

client/i18n/locales/english/intro.json

@@ -3268,7 +3268,12 @@
         ]
       },
       "alda": { "title": "253", "intro": [] },
-      "cvaf": { "title": "254", "intro": [] },
+      "lab-fcc-forum-leaderboard": {
+        "title": "Build an fCC Forum Leaderboard",
+        "intro": [
+          "For this lab you will practice asynchronous JavaScript by coding your own freeCodeCamp forum leaderboard."
+        ]
+      },
       "review-asynchronous-javascript": {
         "title": "Asynchronous JavaScript Review",
         "intro": [

client/src/pages/learn/full-stack-developer/lab-fcc-forum-leaderboard/index.md

@@ -0,0 +1,9 @@
+---
+title: Introduction to the Build an fCC Forum Leaderboard
+block: lab-fcc-forum-leaderboard
+superBlock: full-stack-developer
+---
+
+## Introduction to the Build an fCC Forum Leaderboard
+
+For this lab you will practice asynchronous JavaScript by coding your own freeCodeCamp forum leaderboard.

curriculum/challenges/_meta/lab-fcc-forum-leaderboard/meta.json

@@ -0,0 +1,11 @@
+{
+  "name": "Build an fCC Forum Leaderboard",
+  "isUpcomingChange": true,
+  "usesMultifileEditor": true,
+  "blockType": "lab",
+  "blockLayout": "link",
+  "dashedName": "lab-fcc-forum-leaderboard",
+  "superBlock": "full-stack-developer",
+  "challengeOrder": [{ "id": "673c91f0b934834bc4a3ecc2", "title": "Build an fCC Forum Leaderboard" }],
+  "helpCategory": "JavaScript"
+}

curriculum/superblock-structure/full-stack.json

@@ -524,6 +524,7 @@
           "blocks": [
             { "dashedName": "lecture-understanding-asynchronous-programming" },
             { "dashedName": "workshop-fcc-authors-page" },
+            { "dashedName": "lab-fcc-forum-leaderboard" },
             { "dashedName": "lab-weather-app" },
             { "dashedName": "review-asynchronous-javascript" },
             { "dashedName": "quiz-asynchronous-javascript" }