Move longpaths git config before checkout steps on Windows

The contrib repo checkout was failing on Windows with "Filename too long"
because the longpaths config ran after the checkout. Move it to be the
first step so both checkouts benefit from it.

Assisted-by: Claude Sonnet 4.6

Author: MikeGoldsmith

.github/workflows/templates/test.yml.j2

@@ -43,6 +43,11 @@ jobs:
     runs-on: {{ job_data.os }}
     timeout-minutes: 30
     steps:
+      {%- if job_data.os == "windows-latest" %}
+      - name: Configure git to support long filenames
+        run: git config --system core.longpaths true
+
+      {%- endif %}
       - name: Checkout repo @ SHA - ${% raw %}{{ github.sha }}{% endraw %}
         uses: actions/checkout@v4
       {%- if "getting-started" in job_data.tox_env %}
@@ -62,11 +67,6 @@ jobs:
 
       - name: Install tox
         run: pip install tox-uv
-      {%- if job_data.os == "windows-latest" %}
-
-      - name: Configure git to support long filenames
-        run: git config --system core.longpaths true
-      {%- endif %}
 
       - name: Run tests
         run: tox -e {{ job_data.tox_env }} -- -ra