Refactor Ansible tasks to use fully qualified module names and improve code consistency

- Updated all tasks to use fully qualified module names (e.g., ansible.builtin.shell, ansible.builtin.copy) for clarity and to avoid ambiguity.
- Replaced deprecated 'yum' module with 'dnf' for package management on RedHat-based systems.
- Improved formatting and consistency in task definitions, including the use of double quotes for strings and consistent indentation.
- Removed unnecessary comments and whitespace to enhance readability.
- Ensured that conditions and loops are consistently formatted across all tasks.

roles/common/tasks/apt-gateway.yml

@@ -1,31 +1,27 @@
 ---
-
 - name: (apt-gateway.yml) Install gateway related packages
   ansible.builtin.apt:
     name: "{{ apt_gateway_host_pkgs }}"
     state: "{{ apt_install_state }}"
 
-
 - name: (apt-gateway.yml) Check if file '/etc/logrotate.d/speedtest' exists
   ansible.builtin.stat:
     path: /etc/logrotate.d/speedtest
   register: common_logrotate_speedtest_exists
 
-
 - name: (apt-gateway.yml) Ensure file /etc/logrotate.d/speedtest exists
   ansible.builtin.copy:
     src: "{{ role_path + '/files/etc/logrotate.d/speedtest' }}"
     dest: /etc/logrotate.d/speedtest
     owner: root
     group: root
-    mode: '0644'
+    mode: "0644"
   when:
     - not common_logrotate_speedtest_exists.stat.exists
 
-
 - name: (apt-gateway.yml) Set crontab entry for nightly speedtests
   ansible.builtin.cron:
-    name: 'Speedtest'
+    name: "Speedtest"
     minute: 13
     hour: 0-8
-    job: '/root/bin/admin-stuff/speedtest.sh'
+    job: "/root/bin/admin-stuff/speedtest.sh"