Remove explicit docker-compose install in nodepool-launcher

The nodepool launcher server include the install-docker role which
installs docker-compose via pip then later explicitly installs
docker-compose again with our pip3 role installed pip. These two steps
should be redundant with one another. Now that we're transitioning to
docker compose on Noble we should let install-docker handle this
completely and remove the docker-compose install from nodepool-launcher.

Change-Id: Ibabafd8b5ca26a1ffe04f08996b5fce11980c0a2

playbooks/roles/nodepool-launcher/tasks/main.yaml

@@ -28,13 +28,6 @@
     mode: 0644
   notify: nodepool-launcher Reload apache2
 
-# Do this until 719589/ passes
-- name: Install docker-compose
-  pip:
-    name: docker-compose
-    state: present
-    executable: pip3
-
 - name: Ensure docker compose dir
   file:
     state: directory