fix (elbv2): Use correct format for parsing imported target group ARNs

[clareliguori]

Currently, the following CDK snippet results in outputting the target group ID, not the target group name.

    const importedTgArn = cdk.Fn.importValue('ImportTargetGroupArn');
    const importedTg = elbv2.ApplicationTargetGroup.fromTargetGroupAttributes(stack, 'ImportedTg', {
      targetGroupArn: importedTgArn,
    });
    new cdk.CfnOutput(stack, 'TargetGroupOutput', {
      value: importedTg.targetGroupName,
    });

For example, for a sample target group ARN:

arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/MyTargetGroupName/6a58f7d61e2151d4

The stack above will output 6a58f7d61e2151d4 instead of the desired MyTargetGroupName.

This change fixes the ARN format used for parsing the imported ARN value. It does not impact any existing CDK code passing a raw ARN string (as confirmed by existing unit tests), only CDK code trying to pass tokens such as import values.

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[gitpod-io[bot]]

[TheRealAmazonKendra]

FYI - Ignore the PR Linter right now.

[TheRealAmazonKendra]

@Mergifyio update

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update

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[corymhall]

@Mergifyio update

[mergify[bot]]

update

✅ Branch has been successfully updated

[corymhall]

@Mergifyio update

[mergify[bot]]

update

✅ Branch has been successfully updated

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

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[mergify[bot]]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).