[Image Update] Add docker rootless mode to Azure Cloud Shell

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#### Which image would you like to change?
The base image for cloud shell
#### What changes are you requesting?
Please add docker in rootless mode to the azure cloud shell base image - https://docs.docker.com/engine/security/rootless/#install
#### What scenario are these changes enabling?
This scenario enables scripts to be ran in cloud shell against Azure infrastructure that leverages docker commands, docker images, etc. Also this scenario would enable admins to interact with an Azure Container Registry with docker.
#### By how much does this change change the image size?
Nominal.