repo_build: Do not sync links directory between repo_containers

The links directory is only used by repo_build when creating requirement
wheels. The repo_build process builds wheels for it's own distro/arch combo
in serial. So in a mixed environment, where you might have ubuntu-16.04-x86_64
and ubuntu-18.04-x86_64 repo_containers, heck even centos-7-x86_64 for that
matter, copying the links pointing to pools/distro-arch over to another
repo_container creating wheels for a different distro/arch leads to bad builds
getting deployed later.

We also need to prevent the later lsync config from spreading these out
https://review.opendev.org/#/c/705390/

We can prevent this mix-up from happening even further by setting
repo_build_global_links_path: "{{ repo_build_base_path }}/links/{{ repo_build_os_distro_version }}"
as suggested in https://review.opendev.org/#/c/708115/

This is probably only relevant for stable/rocky.
Depends-On: Ieca6ec9bf898432c76c019a1d2d97c280cd85dce
Change-Id: I3bd6d3d987e32ee11c5f1fcb5c1b4b0fc797e7f9
(cherry picked from commit 4bd52916e7)

tasks/repo_package_sync.yml

@@ -25,8 +25,6 @@
     {{ item.src }}
     {{ repo_build_service_user_name }}@{{ hostvars[groups['repo_all'][0]]['ansible_host'] }}:{{ item.dest }}
   with_items:
-    - src: "{{ repo_build_global_links_path }}"
-      dest: "{{ repo_build_base_path }}"
     - src: "{{ repo_build_release_path }}"
       dest: "{{ repo_build_base_path }}/{{ repo_build_release_version_path }}"
     - src: "{{ repo_build_pool_dir }}"