remove fern check

.github/workflows/fern-check.yml

@@ -1,20 +0,0 @@
-name: 🌿 Fern Check
-
-on:
-  pull_request:
-    branches: [ main ]
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
-
-jobs:
-  run:
-    runs-on: [self-hosted, small]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Check API is valid
-        working-directory: apps
-        run: fern check