Notebook "A Getting Started Guide for Azure Sentinel notebooks with PowerShell" outdated, incompatible and may downgrade libraries in new comput instances

[ktb-jcm]

The notebook file "A Getting Started Guide for Azure Sentinel notebooks with PowerShell" has not been updated in two years.

• Doesn't support Ubuntu Focal 20.04 compute instances
• Requires .NET 5.0 SDK. Current release uses .NET 7
• Most installation steps in the notebook are not necessary on new compute instances created in current Sentinel ML interfaces.

Of note is if you create a new instance and then run this notebook, one of the first steps is to download and install v18.04 of the Microsoft debian repository config, which results in a downgrade. Effectively, this destroys the utility of the compute instance and possibly opens up vulnerabilities.

Current guidance, from the dotnet interactive developers, is provided here: https://github.com/dotnet/interactive/blob/main/docs/NotebookswithJupyter.md

[zhzhao8888]

This notebook has very low usage, we will retire this notebook.