Merge branch 'ps/ci-gitlab-msvc-updates'

CI update. * ps/ci-gitlab-msvc-updates: gitlab-ci: handle failed tests on MSVC+Meson job gitlab-ci: use "run-test-slice-meson.sh" ci: make test slicing consistent across Meson/Make github: fix Meson tests not executing at all meson: fix MERGE_TOOL_DIR with "--no-bin-wrappers" ci: don't skip smallest test slice in GitLab ci: handle failures of test-slice helper