aws-ec2: Support EC2Launch v2 userdata

### Describe the feature

[EC2Launch v2](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2launch-v2.html) supports [passing YAML data as userdata](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2launch-v2-settings.html#ec2launch-v2-example-user-data) instead of the legacy XML formatted user data currently produced by `UserData.forWindows()`.

### Use Case

While EC2Launch v2 is backward compatible with the legacy v1, [that format is less configurable than the yaml format](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html#ec2-windows-user-data).

### Proposed Solution

I think a `UserData.forWindowsV2()` or similar is preferable instead of having a flag switching the behaviour of the current class due to the more numerous available task definitions that can directly be employed. `addS3DownloadCommand()` would still need to be a bespoke script as there are no predefined tasks for this.

### Other Information

Task definitions that can be used in user data can be found at https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2launch-v2-task-definitions.html

EC2Launch v2 has existed for over five years now so it might be mature enought to warrant direct support in CDK.

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS CDK Library version (aws-cdk-lib)

2.231.0

### AWS CDK CLI version

2.1102.0

### Environment details (OS name and version, etc.)

Ubuntu

Start by reading the current UserData.forWindows() implementation and the EC2Launch v2 task definitions linked in the issue. Define the V2 user-data API, including how addS3DownloadCommand() remains a bespoke script, and consider how the available task definitions should be exposed; done means CDK can generate YAML-based EC2Launch v2 userdata without changing legacy behavior.

Written by the indexing model from the issue text.