chore: Remmove check_file_import.yml

.github/workflows/check_file_import.yml

@@ -1,23 +0,0 @@
-on: 
-  push: 
-  pull_request: 
-
-name: check file import
-
-jobs: 
-  check_file_import: 
-    name: check file import 
-    runs-on: ubuntu-latest
-    steps: 
-      - name: clean up
-        run: |
-         find . -name . -o -prune -exec rm -rf -- {} +
-
-      - uses: actions/checkout@v4
-  
-      - name: update HepLean.lean 
-        run: |
-          git ls-files 'HepLean/*.lean' | LC_ALL=C sort | sed 's/\.lean//;s,/,.,g;s/^/import /' > HepLean.lean
-
-      - name: check that all files are imported
-        run: git diff --exit-code