[BUG][Functional] ACM Import Custom Lambda references Physical ID instead of Secret Value causing lookup failure.

[rjjaegeraws]

Bug reports which fail to provide the required information will be closed without action.

Required Basic Info

• Accelerator Version: v1.5.6-a
• Install Type: Upgrade
• Upgrade from version: v1.5.5

Describe the bug

The ACM Custom CFN Resource uses its PhysicalResourceId to determine if there is an existing ACM Cert or not. On CFN resource creation, the PhysicalId would be undefined (expected) and a new ACM cert gets created. The created cert's ARN is returned as the PhysicalResourceId. When this custom CFN Resources is updated, the Lambda uses the PhysicalResourceId as the lookup value to the ACM Cert. This fails as the cert isn't created. Note that a Secret is created to contain the ACM ARN.

Failure Info

• What error messages have you identified, if any: Phase1 fails - "The certification ARN ... is not an imported certificate ARN"
• What symptoms have you identified, if any:

Required files

• Please provide a copy of your config.json file (sanitize if required)

Steps To Reproduce

Unknown at this time

Expected behavior
A clear and concise description of what you expected to happen.

The ACM Custom CFN Resource (i.e. Lambda) should use the ARN value stored in the related Secret, and not use the unchangeable PhysicalResourceId.

Screenshots
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Additional context
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