AWS::MediaPackageV2::Channel return value "IngestEndpoints" not accessible

### Name of the resource

Other

### Resource Name

AWS::MediaPackageV2::Channel

### Issue Description

Created a stack with sample template as below:
```
Resources:
Channel:
DeletionPolicy: Retain
Type: AWS::MediaPackageV2::Channel
Properties:
ChannelName: "mychannel1"
ChannelGroupName: "channelgrp"
```

added outputs in different combinations, all of them threw error "Template format error: Every Value member must be a string."

example:
```
1.
Outputs:
Ingests:
Value: !GetAtt Channel.IngestEndpoints

2.
Outputs:
Ingests:
Value: !Select [0, !GetAtt Channel.IngestEndpoints]
```

### Expected Behavior

Ingest endpoints either having separate return values as endpoint1, endpoint2 or returning a list of two strings so that users can parse it using !Select and access the values.

### Observed Behavior

The format of the output object currently when trying to access !GetAtt .IngestEndpoints is unknown. This is a potential bug that needs to be addressed and fixed so that users would be able to make use of this return value elsewhere in the template/other resources, etc.

### Test Cases

Steps to replicate the issue:
- create a sample channel (v2)
- then update the stack to add outputs trying to access [ingest endpoint] value and observe the error.

[ingest endpoint]: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-mediapackagev2-channel.html#aws-resource-mediapackagev2-channel-return-values:~:text=of%20the%20channel.-,IngestEndpoints,-The%20ingest%20endpoints

### Other Details

_No response_

Reproduce the issue with the sample AWS::MediaPackageV2::Channel template and the documented IngestEndpoints return value, then test the Output variants using !GetAtt and !Select. Done means the ingest endpoint value is exposed in a documented, template-usable form, either as separate values or as a list that CloudFormation can consume.

Written by the indexing model from the issue text.