DOC-2499 - Add ECR read permissions for EKS Pod Identity

[benradstone]

Update: This relates to PCP-5442 and should not be merged until that epic is completed with the associated release.

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📝 Describe the Change

This PR adds ECR read permissions to the Hubble service IAM role guidance when enabling EKS Pod Identity.

These permissions are now believed to be required for the EKS Pod Identity use case.

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💻 Changed Pages

• Add an AWS Account to Palette

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🎫 Jira Tickets

DOC-2499

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