Remove centos 9 task for compose repos setup

In the parent change at [1] we are changing the containers and
image builds for c9 to use the release files and repo-setup
role from quickstart. This removes the task we were previously
using that installed the latest compose repos.

[1] https://review.opendev.org/c/openstack/tripleo-ci/+/818222

Change-Id: Ic505b45af79b61ac7616eda53eee299328888719

roles/tripleo-repos/defaults/main.yml

@@ -6,10 +6,6 @@ centos_mirror_host: "http://mirror.centos.org"
 fedora_mirror_host: "https://mirrors.fedoraproject.org"
 rdo_mirror_host: "https://trunk.rdoproject.org"
 override_repos: ""
-# Url for the CentOS Compose for tripleo yum config module
-compose_url: "https://composes.stream.centos.org/production/{{ compose_id }}/compose"
-# Particular compose id to use
-compose_id: "latest-CentOS-Stream"
 rpm_packages:
   - git
   - python3-libselinux

roles/tripleo-repos/tasks/main.yml

@@ -127,18 +127,6 @@
   args:
     warn: false
 
-- name: Install repos on EL9
-  become: true
-  shell: |
-    set -exo pipefail
-    source {{ workspace }}/venv/bin/activate
-    tripleo-yum-config enable-compose-repos \
-      --disable-all-conflicting \
-      --release centos-stream-9 \
-      --compose-url {{ compose_url }}
-  register: result
-  when: ansible_distribution_major_version is version(8, '>')
-
 - name: Print out the stdout of result
   debug:
     msg: "{{ result }}"