Issue #, if available:
N/A - Internal requirement for SageMaker Studio rootless Docker support

Description of changes:
Enhanced get_docker_host() function in src/sagemaker/local/utils.py to support rootless Docker environments:

• Detect rootless Docker by checking for Cgroup Driver: none in docker info output
• Return fixed IP 172.17.0.1 for rootless Docker instead of localhost
• Maintain backward compatibility with traditional Docker setups
• Enable SageMaker local mode to work correctly in Studio's rootless Docker environment

Testing done:

• Added unit tests for rootless Docker detection (test_get_docker_host_rootless_docker)
• Added unit tests for traditional Docker fallback scenarios (test_get_docker_host_traditional_docker)

We then launch JupyterLab App in 1). a domain without rootlessDocker and 2). a domain with enabled rootlessDocker. And then we create and upload pysdk wheel artifact and install it in the JupyterLab App terminal. We run python -c "from sagemaker.local.utils import get_docker_host; print(get_docker_host())"

• Verified that in 1). traditional Docker environment it returns localhost as expected.
• In the 2). domain with rootless Docker enabled, it returns fixed IP 172.17.0.1.

Ref: https://quip-amazon.com/EvbfAyrac6Nh/SageMaker-Studio-V2-Docker-access-in-VPCOnly-mode#temp:C:bDf835bbc571f5245dfb5e32037b

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