ci: run every test when changing the build

Changing meson options, checks or dependencies can affect drivers, so
they should be tested.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26625>

.gitlab-ci/test-source-dep.yml

@@ -49,6 +49,9 @@
         - .gitlab-ci/**/*
         - include/**/*
         - meson.build
+        - meson_options.txt
+        - build-support/**/*
+        - subprojects/**/*
         - .gitattributes
         - src/*
         - src/compiler/**/*