chore(region-info): eusc-de-east-1 (#34860)

### Reason for this change

Adding new aws partition to cdk : `eusc-de-east-1`

### Description of changes
Changes here allow cdk user to build infrastructure in the new eusc-de-east-1 region : 
- Updated the route53 mappings needed to support a new region
- Updated the assets/entities that are supported in the new region (like DLC repository accounts)
- Integration test snapshots update to support the new region changes


### Description of how you validated changes

Running integration tests

### Checklist
- [ ] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

Author: kumvprat

packages/@aws-cdk-testing/framework-integ/package.json

@@ -30,7 +30,7 @@
   "license": "Apache-2.0",
   "devDependencies": {
     "@aws-cdk/cdk-build-tools": "0.0.0",
-    "@aws-cdk/integ-runner": "^2.188.2",
+    "@aws-cdk/integ-runner": "^2.188.3",
     "@aws-cdk/pkglint": "0.0.0",
     "@aws-sdk/client-acm": "3.632.0",
     "@aws-sdk/client-rds": "3.632.0",

packages/@aws-cdk-testing/framework-integ/test/aws-apigateway/test/integ.restapi.access-log-firehose.js.snapshot/integ.json

@@ -384,6 +384,9 @@
    "eu-west-3": {
     "value": "nodejs22.x"
    },
+   "eusc-de-east-1": {
+    "value": "nodejs22.x"
+   },
    "il-central-1": {
     "value": "nodejs22.x"
    },

packages/@aws-cdk-testing/framework-integ/test/aws-apigateway/test/integ.restapi.access-log-firehose.js.snapshot/manifest.json

@@ -748,7 +748,7 @@
      "S3Bucket": {
       "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
      },
-     "S3Key": "8a84a8f465fbe0c48af2c256847ec9abfe095d23781b749728b998315f3ad732.zip"
+     "S3Key": "c49d356cac773d491c5f7ac148995a1181498a8e289429f8612a7f7e3814f535.zip"
     },
     "Description": "/opt/awscli/aws"
    }
@@ -2150,6 +2150,9 @@
    "eu-west-3": {
     "value": "nodejs22.x"
    },
+   "eusc-de-east-1": {
+    "value": "nodejs22.x"
+   },
    "il-central-1": {
     "value": "nodejs22.x"
    },