Add policy conformance tests to postsubmit windows bazel test workflow.

PiperOrigin-RevId: 933163726

Author: jnthntatum

.github/workflows/windows_bazel_test.yml

@@ -25,4 +25,4 @@ jobs:
         # //... won't work.
         shell: bash
         run: |
-          bazelisk test --config=msvc conformance:all
+          bazelisk test --config=msvc conformance:all conformance/policy:all

.github/workflows/windows_bazel_test_post_merge.yml

@@ -9,5 +9,5 @@ jobs:
   trigger-test:
     # This prevents the workflow from running automatically when someone
     # pushes to their fork.
-    if: github.repository == 'google/cel-cpp'
+    if: github.repository == 'cel-expr/cel-cpp'
     uses: ./.github/workflows/windows_bazel_test.yml