[ECS] Windows GPU container support

### Summary
Could you support Windows GPU containers:
https://docs.microsoft.com/en-us/virtualization/windowscontainers/deploy-containers/gpu-acceleration

This would facilitate using AWS CodeBuild as a CI solution for cross-platform projects that need to run GPU tests on Windows.

The issue names no repository files, entry points, or tests. Start by reading the linked Microsoft Windows GPU container guidance and investigating how ECS and AWS CodeBuild currently handle Windows containers; done should be demonstrated support for running Windows GPU containers for the stated cross-platform GPU-test use case.

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