Add support of OCI helm charts from ECR CN region

[yubingjiaocn]

Issue # (if applicable)

Closes #28460 .

Reason for this change

Current implementation will not identity helm charts stored in ECR on AWS CN regions, and will treat ECR as simple, unauthorized repository.

Description of changes

This change add support of ECR on AWS CN region by adding a optional suffix of .cn to the regex.

Description of how you validated changes

Run the affected regex against helm repo in ECR China (123456789012.dkr.ecr.cn-northwest-1.amazonaws.com.cn)

import re
repository = 'oci://123456789012.dkr.ecr.cn-northwest-1.amazonaws.com.cn'
private_ecr_pattern = 'oci://(?P<registry>\d+\.dkr\.ecr\.(?P<region>[a-z0-9\-]+)\.amazonaws\.com(\.cn)?)*'
private_registry = re.match(private_ecr_pattern, repository).groupdict()
print(private_registry['registry'])

This snippet will return 123456789012.dkr.ecr.cn-northwest-1.amazonaws.com.cn

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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[aws-cdk-automation]

Your pull request must be based off of a branch in a personal account (not an organization owned account, and not the main branch). You must also have the setting enabled that allows the CDK team to push changes to your branch (this setting is enabled by default for personal accounts, and cannot be enabled for organization owned accounts). The reason for this is that our automation needs to synchronize your branch with our main after it has been approved, and we cannot do that if we cannot push to your branch.

[mergify]

⚠️ The sha of the head commit of this PR conflicts with #29778. Mergify cannot evaluate rules on this PR. ⚠️

[aws-cdk-automation]

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0d3898e
• Result: SUCCEEDED
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