[AWS::UXC::AccountColor] - [Coverage] - Account color support (AWS User Experience Customization)

### Name of the resource

Other

### Resource name

AWS::Account::ConsoleCustomization

### Description

Recently released AWS User Experience Customization (UXC) functionality allowing customers to visually distinguish AWS accounts in the Management Console by applying a custom account color banner.
https://docs.aws.amazon.com/awsconsolehelpdocs/latest/gsg/getting-started-uxc.html

This is currently configurable via the console / [API actions](https://docs.aws.amazon.com/awsconsolehelpdocs/latest/gsg/actions.html):

- [`GetAccountColor`](https://docs.aws.amazon.com/awsconsolehelpdocs/latest/gsg/GetAccountColor.html)
- [`PutAccountColor`](https://docs.aws.amazon.com/awsconsolehelpdocs/latest/gsg/PutAccountColor.html)
- [`DeleteAccountColor`](https://docs.aws.amazon.com/awsconsolehelpdocs/latest/gsg/DeleteAccountColor.html)

However, this functionality is not yet supported in AWS CloudFormation.

Example resource model (illustrative):

```yaml
Resources:
AccountConsoleColor:
Type: AWS::Account::ConsoleCustomization
Properties:
AccountColor: "#FF9900"
```

Alternative naming could include:
- `AWS::Console::AccountColor`
- `AWS::UXC::AccountColor`
- `AWS::Account::AccountColor`

### Other Details

Terraform related issue:
- https://github.com/hashicorp/terraform-provider-aws/issues/44033

Review the linked UXC getting-started and API-action documentation first, then inspect the repository’s existing CloudFormation coverage process for comparable AWS resources. Done means an agreed resource model and coverage path for GetAccountColor, PutAccountColor, and DeleteAccountColor, including the proposed naming and AccountColor property.

Written by the indexing model from the issue text.