update euid CF template and desc

Author: lizk886

scripts/aws/EUID_CloudFormation.template.yml

@@ -38,6 +38,8 @@ Parameters:
       - m6i.4xlarge
       - r6i.2xlarge
       - r6i.4xlarge
+      - r7i.2xlarge
+      - r7i.4xlarge
     ConstraintDescription: must be a valid EC2 instance type.
   RootVolumeSize:
     Description: Instance root volume size
@@ -90,7 +92,7 @@ Metadata:
       DeployToEnvironment:
         default: EUID environment to deploy to. Prod - production; Integ - integration test.
       InstanceType:
-        default: Instance Type for EC2. Minimum 4 vCPUs needed. M5, M5a, M5n, M6i and R6i Instance types are tested. Choose 2xlarge or 4xlarge.
+        default: Instance Type for EC2. Minimum 4 vCPUs needed. M5, M5a, M5n, M6i, R6i and R7i Instance types are tested. Choose 2xlarge or 4xlarge.
       SSHKeyName:
         default: Key Name for SSH to EC2 (required)
       RootVolumeSize: