ci/crosvm: clean crosvm socket

When the 'vm stop' command fails because the crosvm instance
that would be listening to it is already dead, remove the
socket file to avoid crosvm complaining and refusing to boot

Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16963>

.gitlab-ci/crosvm-runner.sh

@@ -54,7 +54,7 @@ VM_SOCKET=crosvm-${THREAD}.sock
 # was terminated due to timeouts.  This "vm stop" may fail if the crosvm died
 # without cleaning itself up.
 if [ -e $VM_SOCKET ]; then
-   crosvm stop $VM_SOCKET || true
+   crosvm stop $VM_SOCKET || rm -rf $VM_SOCKET
    # Wait for socats from that invocation to drain
    sleep 5
 fi