Add cross-account ACK pattern

[candonov]

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What is the outcome that you are trying to reach?

An ACK pattern showcasing cross-account access.

Describe the solution you would like

An example for cross-account according to the docs and aws-controllers-k8s/community#2031

Describe alternatives you have considered

None.

Additional context

This is one of 3 patterns for ACK
ack
├── basic
├── fully-private
└── cross-account

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[github-actions]

Issue closed due to inactivity.