Update devops-controller track to AAP 2.4

[craig-br]

Code server role:

• Changed student_user variable to student_username.
• Update defaults to the latest code-server version.
• Linting.

50_install_controller.yml

• Linting.
• Replaced command module with community.general.ansible_galaxy_install.

images/ansible/common/5_configure_users.yml

• Replaced lineinfile module with community.general.sudoers.

images/ansible/common/60_check_vars.yml

• Added a check to skip vault variables file if it doesn't exist.

images/ansible/common/70_controller_post_install.yml

• Linting.
• Fixed S3 bucket path.

devops-controller track files

• Updated to AAP 2.4 RHEL 9.
• Fixed code-server ansible-lint issues.
• Updated screenshots.