Check normalization tests diff in CI

Author: Jules-Bertholet

.github/workflows/rust.yml

@@ -70,5 +70,7 @@ jobs:
         python-version: '3.12'
     - name: Regen
       run: cd scripts && python3 unicode.py
-    - name: Diff
+    - name: Diff tables
       run: diff src/tables.rs scripts/tables.rs
+    - name: Diff tests
+      run: diff tests/data/normalization_tests.rs scripts/normalization_tests.rs