chore(route53): support new partition in route53 cross-account delegator (#34879)

### Reason for this change

This adds support for the eusc-de partition, without this we cannot perform DNS delegation in any regions in such partition. 

See 3a78125 for similar issues

### Description of changes
Simply added the new eusc-de partition to a list of already hardcoded partitions

### Describe any new or updated permissions being added

N/A


### Description of how you validated changes



### Checklist


----

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

Author: leonmk-aws

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packages/@aws-cdk-testing/framework-integ/test/aws-route53/test/integ.cross-account-zone-delegation.js.snapshot/asset.b1d35da8d7e1bcf062d109e09da52cfab9dab0080defa0c68fe7fb4f0076ce11/__entrypoint__.js renamed to packages/@aws-cdk-testing/framework-integ/test/aws-route53/test/integ.cross-account-zone-delegation.js.snapshot/asset.2a1e3a5c062d73050b47001ce8443b5cce3002e2af38029f60659b7002ce4b51/__entrypoint__.js

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packages/@aws-cdk-testing/framework-integ/test/aws-route53/test/integ.cross-account-zone-delegation.js.snapshot/asset.b1d35da8d7e1bcf062d109e09da52cfab9dab0080defa0c68fe7fb4f0076ce11/index.js renamed to packages/@aws-cdk-testing/framework-integ/test/aws-route53/test/integ.cross-account-zone-delegation.js.snapshot/asset.2a1e3a5c062d73050b47001ce8443b5cce3002e2af38029f60659b7002ce4b51/index.js

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