Refactor lmn_wlan role

- Consolidate `lmn_wlan`, `lmn_wlan_nm`, and `lmn_wlan_8021x` into single `lmn_wlan` role.
- Implement a check for the availability of the radius-server during the EAP-TLS rollout.
- Enhance variable support with a standardized naming schema:
    - Mode selection via `wlan` variable (`none`, `psk`, `eap-tls`).
    - EAP-TLS CA configuration (CA information, email address, CA password).
    - Introduce a switch to force the (re-)issue of existing certificates.
    - PSK configuration through `wlan_ssid` and `wlan_password`.
- Add a check to verify if the radius certificate is revoked.
- Ensure required packages and services are only installed and configured if the `wifi` variable is set.

roles/lmn_wlan/tasks/main.yml

@@ -1,30 +0,0 @@
----
-- name: Install packages related to wifi
-  ansible.builtin.apt:
-    name:
-      - systemd-resolved
-      - firmware-realtek # for our wifi sticks
-
-- name: Provide service to enable WiFi on boot
-  ansible.builtin.copy:
-    dest: /etc/systemd/system/enable-wifi.service
-    mode: '0644'
-    content: |
-      [Unit]
-      Description=Switch WiFi on
-      After=NetworkManager.service
-
-      [Service]
-      Type=oneshot
-      ExecStart=/usr/bin/nmcli radio wifi on
-
-      [Install]
-      WantedBy=multi-user.target
-  when: "'teacherlaptop' not in group_names"
-
-- name: Enable the enable-wifi service
-  ansible.builtin.systemd:
-    name: enable-wifi.service
-    enabled: true
-    daemon_reload: true
-  when: "'teacherlaptop' not in group_names"