Add ability to configure AppArmor for build pod Security Context

Description

Add ability to configure AppArmor Profile for build pod or container.

Proposal

Add a new option in the [runners.kubernetes.pod_security_context] section to set the appArmorProfile for the build pod.

Links to related issues and merge requests / references

• https://kubernetes.io/docs/tutorials/security/apparmor/#appArmorProfile
• https://docs.gitlab.com/runner/executors/kubernetes/#set-a-security-policy-for-the-pod