Fixing the forever looping redirect (#4723)

## What are you changing in this pull request and why?

Brought up by @bethanyhipple-dbtlabs in Slack that there's a weird error
message when you git `test-configs` or `data-test-configs` and I figured
out why. We're forwarding data-test-configs to test-configs and
test-configs to data-test-configs 😆

This should fix it!

## Checklist
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Adding or removing pages (delete if not applicable):
- [ ] Add/remove page in `website/sidebars.js`
- [ ] Provide a unique filename for new pages
- [ ] Add an entry for deleted pages in `website/static/_redirects`
- [ ] Run link testing locally with `npm run build` to update the links
that point to deleted pages

website/vercel.json

@@ -3847,11 +3847,6 @@
       "destination": "/dbt-cloud/api",
       "permanent": true
     },
-    {
-      "source": "/reference/data-test-configs",
-      "destination": "/reference/test-configs",
-      "permanent": true
-    },
     {
       "source": "/reference/declaring-properties",
       "destination": "/reference/configs-and-properties",