Remove kolla_install_type variable

Kolla removed support for binary images in the Zed release, as well as
the install_type config option. It also changed the image tag format.

Yoga & earlier:

  openstack.kolla/centos-source-base:yoga

Zed & later:

  openstack.kolla/base:zed-centos-stream9

This change removes the kolla_install_type variable. It also adds a
kolla_base_distro_version variable, which is passed to kolla and
kolla-ansible.

The following two variables are also removed, since all images are now
of type source:

* overcloud_container_image_regex_map_source
* overcloud_container_image_regexes_source

Change-Id: I0023765438c0c73394c3465828c4d98f766d9350