revert to fail_ci_if_error: true

Author: dugalh

.github/workflows/run-unit-tests.yml

@@ -51,7 +51,7 @@ jobs:
     - name: Upload coverage
       uses: codecov/codecov-action@v4
       with:
-        fail_ci_if_error: false
+        fail_ci_if_error: true
         files: ./coverage.xml
         token: ${{ secrets.CODECOV_TOKEN }}
         verbose: true