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/cron.yml

@@ -77,7 +77,7 @@
     - user_crontab
 
 - name: (cron.yml) Set env entries in user crontabs
-  cron:
+  ansible.builtin.cron:
     name: "{{ item.name }}"
     env: "yes"
     user: '{{ item.user | default("root") }}'
@@ -91,7 +91,7 @@
     - user_crontab
 
 - name: (cron.yml) Set special time entries in user crontabs
-  cron:
+  ansible.builtin.cron:
     name: "{{ item.name }}"
     special_time: "{{ item.special_time }}"
     user: '{{ item.user | default("root") }}'
@@ -105,7 +105,7 @@
     - user_crontab
 
 - name: (cron.yml) Set normal entries in user crontabs
-  cron:
+  ansible.builtin.cron:
     name: "{{ item.name }}"
     minute: "{{ item.minute | default(omit) }}"
     hour: "{{ item.hour | default(omit) }}"