aws-ec2: Support PlacementGroup in LaunchTemplate

[clayrosenthal]

Describe the feature

You should be able to pass a PlacementGroup construct to the LaunchTemplate construct to make the instances launched with that template use that placement group.

Use Case

When you define a PlacementGroup and want to create a LaunchTemplate that uses it, you have to use the L1 CfnLaunchTemplate or do some weird half and half of creating an L2 LaunchTemplate then casting it as the L1 to edit the corresponding property.

Proposed Solution

Allow for an optional placementGroup prop that implements IPlacementGroup in LaunchTemplateProps

Other Information

The Instance construct already supports such a prop

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.178.2

Environment details (OS name and version, etc.)

macOS 15.3.1 (24D70)

[pahud]

Thank you. I've noticed you are having a PR WIP. We'll review your PR when it's ready.