GH Actions: stop running sbt test in compiler

I think it's unnecessary to run it here, since we have a CI pipeline
directly in the `kaitai_struct_compiler` repo that does the same thing:
https://github.com/kaitai-io/kaitai_struct_compiler/blob/12dbc32226eb9e94b76f803f3c8ff5f8943e5f8d/.github/workflows/test.yml

.github/workflows/main.yml

@@ -75,10 +75,6 @@ jobs:
           gpg_passphrase: ${{ secrets.GPG_PASSPHRASE }}
         if: github.event_name == 'push' && github.ref == 'refs/heads/master'
 
-      - name: translator-tests
-        run: |
-          cd tests
-          ./translator-tests || true
       - name: build-formats
         run: |
           cd tests