(AWS::EC2::LaunchTemplate) - allow to set VersionDescription for all VersionNumbers of an LaunchTemplate via CFN

### Name of the resource

AWS::EC2::LaunchTemplate

### Resource name

_No response_

### Description

#### summary/impact
We are using AWS ImageBuilder to build new AMIs. Afterwards we update the existing Launch template using CDK (CFN) managed by a AWS CodePipeline - Hence, we generate new Launch template versions for an remaining Launch template ID.
For debugging reasons, sometimes people check details of such Launch template via AWS Console. As said before, the active version is not the first Launch template version, hence we are not able to set the Description via CloudFormation.

#### is-state

Currently only Version 1 has a Description as stated in [CloudFormation Documentation](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-launchtemplate.html#cfn-ec2-launchtemplate-versiondescription):
> VersionDescription
> A description for the **first** version of the launch template.

#### target state

We should be able to set a Description for all Launch template versions via CloudFormation.

### Other Details


Start with the AWS::EC2::LaunchTemplate resource and its VersionDescription documentation, then review how CloudFormation represents launch template versions. Done means CloudFormation can set a description for every launch template version, not only the first, with the behavior documented for users.

Written by the indexing model from the issue text.