ci/vkd3d: rename vkd3d runner script to vkd3d-runner.sh to match the other ones

Moving it out of an otherwise-empty folder.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30413>

.gitlab-ci/prepare-artifacts.sh

@@ -38,7 +38,6 @@ cp -Rp .gitlab-ci/fossilize-runner.sh install/
 cp -Rp .gitlab-ci/crosvm-init.sh install/
 cp -Rp .gitlab-ci/*.txt install/
 cp -Rp .gitlab-ci/report-flakes.py install/
-cp -Rp .gitlab-ci/vkd3d-proton install/
 cp -Rp .gitlab-ci/setup-test-env.sh install/
 cp -Rp .gitlab-ci/*-runner.sh install/
 cp -Rp .gitlab-ci/bin/structured_logger.py install/