Update Azure submodules and add R kernel troubleshooting

[Kris10win]

Pull Request Template

Description

This PR updates Azure pathway analysis notebooks in Submodules 02–04 to improve execution and usability. It also adds an optional R kernel troubleshooting section to the Azure README and a helper bash script
(install_r_irkernel.sh) to install and register the R IRkernel when the R kernel is unavailable in Jupyter.
All modified notebooks were run top-to-bottom, and the installation script was validated in an Azure-style Ubuntu environment.
Not associated with a tracked issue.

Assignee

@kyleoconnell-NIH and @rosscampbellNIH

PR checklist

Please ensure the following:

• [X ] This comment contains a description of changes (with reason).
• [ X] All changes were tested.
• If you've fixed a bug mention the issue number/name.
• [ X] Apply approriate tags (e.g. documentation, bug)

[Kris10win]

Thanks for reviewing! I work with the NIH STRIDES program, and these updates are intended to support an upcoming workshop. Happy to make any requested changes.