ci: get rid of integration tests - broken, unmaintained

The container based integration tests are broken and
unmaintained.  We don't need them anymore anyway.

If you want to run tests in a container, use tox-lsr.
https://github.com/linux-system-roles/tox-lsr?tab=readme-ov-file#container-testing

Signed-off-by: Rich Megginson <[email protected]>

Author: richm

.github/Dockerfile.c7-network-role

@@ -70,51 +70,3 @@ ansible-playbook --skip-tags tests::cleanup \
 
 [NM 1.0](https://lazka.github.io/pgi-docs/#NM-1.0), it contains a full
 explanation about the NetworkManager API.
-
-### Integration tests with podman
-
-1. Create `~/.ansible/collections/ansible_collections/containers/podman/` if this
-  directory does not exist and `cd` into this directory.
-
-    ```bash
-    mkdir -p ~/.ansible/collections/ansible_collections/containers/podman/
-    cd ~/.ansible/collections/ansible_collections/containers/podman/
-    ```
-
-2. Clone the collection plugins for Ansible-Podman into the current directory.
-
-    ```bash
-    git clone https://github.com/containers/ansible-podman-collections.git .
-    ```
-
-3. Change directory into the `tests` subdirectory.
-
-    ```bash
-    cd ~/network/tests
-    ```
-
-4. Use podman with `-d` to run in the background (daemon). Use `c7` because
-  `centos/systemd` is centos7.
-
-    ```bash
-    podman run --name lsr-ci-c7 --rm --privileged \
-    -v /sys/fs/cgroup:/sys/fs/cgroup:ro \
-    -d registry.centos.org/centos/systemd
-    ```
-
-5. Use `podman unshare` first to run "podman mount" in root mode, use `-vi` to
-  run ansible as inventory in verbose mode, use `-c podman` to use the podman
-  connection plugin. NOTE: Some of the tests do not work with podman - see
-  `.github/run_test.sh` for the list of tests that do not work.
-
-    ```bash
-    podman unshare
-    ansible-playbook -vi lsr-ci-c7, -c podman tests_provider_nm.yml
-    ```
-
-6. NOTE that this leaves the container running in the background, to kill it:
-
-    ```bash
-    podman stop lsr-ci-c7
-    podman rm lsr-ci-c7
-    ```