feat(ec2): Adding placementGroup prop to LaunchTemplate

[clayrosenthal]

Issue # (if applicable)

Closes #33721

Reason for this change

To allow for passing PlacementGroups to LaunchTemplates

Description of changes

Adding placementGroup to LaunchTemplateProps. I chose to only implement this part of the placement field in LaunchTemplates, not doing anything with dedicated hosts or the like, as those don't have any CDK constructs. This change enables creating a PlacementGroup and passing it to a LaunchTemplate

Describe any new or updated permissions being added

None

Description of how you validated changes

Added a unit test, ran the existing tests as well.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

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❌ Features must contain a change to a README file.
❌ Features must contain a change to an integration test file and the resulting snapshot.
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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: bd10ce0
• Result: SUCCEEDED
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