fix some SageMaker examples

[jameslamb]

Contributes to #374.

Fixes the following:

• https://docs.rapids.ai/deployment/nightly/cloud/aws/sagemaker/
• https://docs.rapids.ai/deployment/nightly/examples/rapids-sagemaker-higgs/notebook

Improves the following, but not sure if it is totally working:

• https://docs.rapids.ai/deployment/nightly/examples/rapids-sagemaker-hpo/notebook

The higgs notebook in particular was badly broken... in ways that make me suspect it's been in a bad state for a few releases.

Notes for Reviewers

There are a LOT of changes here, I've tried to add inline comments explaining all of them.

How does this "improve" but not "fix" the rapids-sagemaker-hpo notebook?

I wasn't able to run it to completion because the AWS account I was in had service quotas limiting me to 1 ml.p3.2xlarge or ml.p3.8xlarge instance, and that notebook needs at least 2.

References

• https://docs.aws.amazon.com/sagemaker/latest/dg/your-algorithms-training-algo-dockerfile.html
• https://github.com/rapidsai/docker/issues/583
• https://docs.rapids.ai/notices/rsn0030/
• https://github.com/rapidsai/docker/issues/539
• entrypoint in rapidsai/base container images: https://github.com/rapidsai/docker/blob/190b3317ff5afb035e52bda7304d14b8d4de30b4/Dockerfile#L114

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[jameslamb]

From our conversation earlier today... I think this is ready to merge @jacobtomlinson