ci: clarify matrix job names

Author: mldangelo

.github/workflows/test.yml

@@ -62,7 +62,7 @@ jobs:
         run: uv run mypy src/promptfoo/
 
   test:
-    name: Test Python ${{ matrix.python-version }}
+    name: Test (py${{ matrix.python-version }}, ${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     timeout-minutes: 15
     strategy:
@@ -101,7 +101,7 @@ jobs:
         run: uv run python -c "from promptfoo.cli import check_node_installed, check_npx_installed; assert check_node_installed(); assert check_npx_installed()"
 
   test-npx-fallback:
-    name: Test npx fallback on ${{ matrix.os }}
+    name: Test npx fallback (py${{ matrix.python-version }}, ${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     timeout-minutes: 15
     strategy: