Add AWS ECR error message for tag Immutability

[jaugustin]

Description

• This improve the new feature Tag immutability Tag Immutability off but can't override image, which is not even present [ECR ARM] Issue aws/containers-roadmap#862 to make it compatible with AWS ECR immutability error message

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• Includes unit tests
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• The code flow looks good.
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- kaniko adds a new flag `--registry-repo` to override registry

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[aaron-prindle]

Thanks for the PR here @jaugustin . Can you rebase the PR here from HEAD and re-submit , recently a CI/CD fix was made for test error seen

[jaugustin]

@aaron-prindle I rebased the PR

[jaugustin]

@aaron-prindle is there something else I should do ?

[aaron-prindle]

LGTM, thanks @jaugustin!