Rename and update upload step for subsys Twister results in zephyr.yml

Author: skarg

.github/workflows/zephyr.yml

@@ -56,10 +56,10 @@ jobs:
           name: twister-out.unit_testing
           path: twister-out.unit_testing
           if-no-files-found: warn
-      - name: Upload native_sim Twister results
+      - name: Upload subsys Twister results
         if: ${{ always() }}
         uses: actions/upload-artifact@v4
         with:
-          name: twister-out.native_sim
-          path: twister-out.native_sim
+          name: twister-out.subsys
+          path: twister-out.subsys
           if-no-files-found: warn