chore(workflows/CI): change git diff to not be quiet anymore

to show which files / tests failed in a short summary

.github/workflows/CI.yml

@@ -64,7 +64,7 @@ jobs:
             ~/.cargo
           key: ${{ runner.os }}-cargo-dev-${{ hashFiles('**/Cargo.lock') }}
       - run: bash test/test_all.sh
-      - run: git diff --exit-code --quiet || exit 1
+      - run: git diff --exit-code --stat || exit 1
 
   # things that use the cargo-test cache
   test: