Create final task including lmn_finish and lmn_tmpfixes

lmn_tmpfixes is used for:
- temporary fixes and quirks
- cleaning up stuff from obsolete/erroneous tasks

lmn_finish is used for:
- installing extra_pkg
- setting ansible-stamps

roles/lmn_extrapkgs/tasks/main.yaml

@@ -1,27 +0,0 @@
----
-- name: Merge extra_pkgs and extra_pkgs_bpo lists
-  ansible.builtin.set_fact:
-    extra_pkgs: "{{ extra_pkgs + lookup('vars', 'extra_pkgs' + item, default=[]) }}"
-    extra_pkgs_bpo: "{{ extra_pkgs_bpo + lookup('vars', 'extra_pkgs_bpo' + item, default=[]) }}"
-  loop: "{{ range(1, 11) | map('string') | list }}"
-
-- name: Install extra packages from stable
-  ansible.builtin.apt:
-    name: "{{ extra_pkgs }}"
-  when: extra_pkgs|length
-
-- name: Add backports for {{ ansible_distribution_release }}
-  ansible.builtin.apt_repository:
-    repo: >
-      deb http://deb.debian.org/debian/ {{ ansible_distribution_release }}-backports
-      main non-free-firmware
-    state: present
-    update_cache: true
-  when: extra_pkgs_bpo|length
-
-- name: Install extra packages from backports
-  ansible.builtin.apt:
-    name: "{{ extra_pkgs_bpo }}"
-    state: latest # noqa package-latest
-    default_release: "{{ ansible_distribution_release }}-backports"
-  when: extra_pkgs_bpo|length