AWS::CloudFront::OriginRequestPolicy generic error message if the policy is duplicated

### Name of the resource

AWS::CloudFront::OriginRequestPolicy

### Resource name

_No response_

### Description

If an origin request policy with the same name already exists, the resource creation failed after ~3 minutes with generic error message: "Internal error reported from downstream service during operation 'AWS::CloudFront::OriginRequestPolicy'."

Please improve the error message to inform the user about the duplication:

Steps to replicate the issue:

1. Create a stack with AWS::CloudFront::OriginRequestPolicy resource:
```
Resources:
OriginRequestPolicy:
Type: AWS::CloudFront::OriginRequestPolicy
Properties:
OriginRequestPolicyConfig:
HeadersConfig:
Headers:
- User-Agent
- true-client-ip
- Accept
- x-api-key
HeaderBehavior: whitelist
CookiesConfig:
CookieBehavior: none
QueryStringsConfig:
QueryStringBehavior: all
Name: client-origin-request-policy
```
The stack should be created successfully
2. Create the second stack with the exact same template => The error can be seen.

### Other Details

_No response_

The issue provides a CloudFormation template and reproduction steps but names no source files or tests. Start by creating two stacks with the same AWS::CloudFront::OriginRequestPolicy, then verify that the second creation reports a specific duplicate-policy error instead of the generic downstream-service message.

Written by the indexing model from the issue text.