chore(curriculum): fix + test curriculum order (#44366)

* chore(tools): test curriculum order

* chore: update orders

* fix(tests): temporarily ignore cert super

The Relational Databases cert being 'upcomingChanges' is breaking
the tests.

* fix: graphql query here

* fix: use only one meta

* chore: remove unnecessary superOrders

* chore: zero-based indexing

* fix: update mock

* refactor: remove unused fixture

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

curriculum/challenges/_meta/learn-relational-databases/meta.json

@@ -2,12 +2,12 @@
   "name": "Learn Relational Databases",
   "isUpcomingChange": true,
   "dashedName": "learn-relational-databases",
-  "order": 2,
+  "order": 0,
   "time": "",
   "template": "",
   "required": [],
   "superBlock": "relational-databases",
-  "superOrder": 5,
+  "superOrder": 4,
   "challengeOrder": [
     [
       "5ea8adfab628f68d805bfc5e",