[v9.5.x] CI: Move windows-tests into promotion pipeline (#68218) (#68231)

(cherry picked from commit acd02e8a48)

Backport of https://github.com/grafana/grafana/pull/68218

scripts/drone/steps/lib.star

@@ -686,7 +686,6 @@ def test_backend_step(image = build_image):
 
 def windows_test_backend_step():
     step = test_backend_step(image = windows_go_image)
-    step["failure"] = "ignore"
     return step
 
 def test_backend_integration_step():
@@ -1361,6 +1360,19 @@ def publish_linux_packages_step(edition, package_manager = "deb"):
         },
     }
 
+def windows_clone_step():
+    return {
+        "name": "clone",
+        "image": wix_image,
+        "environment": {
+            "GITHUB_TOKEN": from_secret("github_token"),
+        },
+        "commands": [
+            'git clone "https://$$env:GITHUB_TOKEN@github.com/$$env:DRONE_REPO.git" .',
+            "git checkout -f $$env:DRONE_COMMIT",
+        ],
+    }
+
 def get_windows_steps(edition, ver_mode):
     """Generate the list of Windows steps.