Overpass key rename

Originally, the overpass key was named OVERPASS_API throughout the code. My final change in the original PR was to rename the key to GEOFABRIK_OVERPASS_KEY. However, when naming the secret in the server actions repo, I wrongfully told shankari to name it GEOFABRIK_OVERPASS_KEY, rather than the OVERPASS_API that is functional in my fork. Renaming the secret when it's pulled from the github repo should fix this issue.

.github/workflows/test-overpass.yml

@@ -21,7 +21,7 @@ jobs:
       # Runs TestOverpass.py to check for API functionality
     - name: Test Overpass
       env:
-        GEOFABRIK_OVERPASS_KEY: '${{ secrets.OVERPASS_API }}'
+        GEOFABRIK_OVERPASS_KEY: '${{ secrets.GEOFABRIK_OVERPASS_KEY }}'
       run: |
         echo Testing overpass!
         chmod +x emission/individual_tests/setup_and_test_overpass.sh