fix(servicecatalogappregistry): Imported attribute group cannot be associated to an application

[liwewang-amazon]

associateWith was not in IAttributeGroup interface. This makes AttributeGroup.fromAttributeGroupArn() couldn't use associateWith method.

This commit moves associateWith toIAttributeGroup interface, so that imported attribute group can use associateWith to an application.

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 2ae86f8
• Result: SUCCEEDED
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