Add AppArmor as Cluster App

What does this MR do?

Add AppArmor as Cluster App: This change supports custom file for AppArmor and adds proper documentation.

Related Chart: https://gitlab.com/gitlab-org/charts/apparmor

Related issue: #218441 (closed)

This MR depends on gitlab-org/cluster-integration/cluster-applications!100 (merged)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done