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/first-run.yml

@@ -1,11 +1,9 @@
 ---
-
 - hosts: o25.oopen.de
 
   tasks:
+    - name: Ensure aptitude is present
+      raw: test -e /usr/bin/aptitude || apt-get install aptitude -y
 
-  - name: Ensure aptitude is present
-    raw: test -e /usr/bin/aptitude || apt-get install aptitude -y
-
-  - name: Ensure python2 is present (This is necessary for ansible to work properly)
-    raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)
+    - name: Ensure python2 is present (This is necessary for ansible to work properly)
+      raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)