feat(ec2): add i7i instance class (#34453)

### Issue # (if applicable)
None

### Reason for this change
https://aws.amazon.com/about-aws/whats-new/2025/04/amazon-ec2-i7i-high-performance-storage-optimized-instances/

### Description of changes
EC2 add i7i instance class

### Description of how you validated changes
```console
$ aws ec2 describe-instance-types | grep -e i7i
            "InstanceType": "i7ie.18xlarge",
            "InstanceType": "i7ie.24xlarge",
            "InstanceType": "i7i.12xlarge",
            "InstanceType": "i7i.2xlarge",
```

### Checklist
- [x] 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: phuhung273

packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts

@@ -858,6 +858,16 @@ export enum InstanceClass {
    */
   I7IE = 'i7ie',
 
+  /**
+   * I/O-optimized instances with local NVME drive powered by 5th generation Intel Xeon Scalable processors, 7th generation
+   */
+  IO7_INTEL = 'io7_intel',
+
+  /**
+   * I/O-optimized instances with local NVME drive powered by 5th generation Intel Xeon Scalable processors, 7th generation
+   */
+  I7I = 'i7i',
+
   /**
    * Storage optimized instances powered by Graviton4 processor, 8th generation
    */
@@ -1845,6 +1855,8 @@ export class InstanceType {
       [InstanceClass.IS4GEN]: 'is4gen',
       [InstanceClass.STORAGE7_INTEL_STORAGE_OPTIMIZED]: 'i7ie',
       [InstanceClass.I7IE]: 'i7ie',
+      [InstanceClass.IO7_INTEL]: 'i7i',
+      [InstanceClass.I7I]: 'i7i',
       [InstanceClass.STORAGE8_GRAVITON]: 'i8g',
       [InstanceClass.I8G]: 'i8g',
       [InstanceClass.BURSTABLE2]: 't2',