Revert temporary 3.15 import probe

Root cause identified: the numpy 2.6.0.dev0 cp315 win_amd64 wheel crashes with
a Windows access violation when numpy.random is imported (triggered via
torch._dynamo during 'import torchvision'). That is an upstream numpy nightly
wheel bug on Windows/3.15, not a test-infra issue.

Author: atalman

.github/workflows/build_wheels_windows.yml

@@ -371,13 +371,6 @@ jobs:
           else
             ${CONDA_RUN} pip install "${{ inputs.repository }}/dist/$WHEEL_NAME"
           fi
-          # TEMP DEBUG (3.15): the smoke test crashes on import with no traceback.
-          # Probe imports under faulthandler to surface the real failure/C stack.
-          if [[ "${{ startsWith(matrix.python_version, '3.15') }}" == "true" ]]; then
-            echo "::group::3.15 import probe"
-            ${CONDA_RUN} python -X faulthandler -c "import sys, torch; print('TORCH', torch.__version__); import numpy; print('NUMPY', numpy.__version__); import torchvision; print('TORCHVISION', torchvision.__version__)" 2>&1 || echo "IMPORT_PROBE_FAILED rc=$?"
-            echo "::endgroup::"
-          fi
           if [[ ! -f "${{ inputs.repository }}"/${SMOKE_TEST_SCRIPT} ]]; then
             echo "${{ inputs.repository }}/${SMOKE_TEST_SCRIPT} not found"
             ${CONDA_RUN} "${{ inputs.repository }}/${ENV_SCRIPT}" python -c "import ${PACKAGE_NAME}; print('package version is ', ${PACKAGE_NAME}.__version__)"