Allow researchers to install packages using the Nexus shared service on Azure Databricks service clusters

[guybartal]

Description

As a researcher / data engineer
I want to be able to install packages using the Nexus shared service on my Azure Databricks clusters
So that I can use it in my notebooks

Acceptance criteria

• User is able to install libraries on databricks cluster published in Nexus shared service

Technical references:

• https://help.sonatype.com/repomanager3/nexus-repository-administration/formats/pypi-repositories#PyPIRepositories-Download,searchandinstallpackagesusingpip
• https://learn.microsoft.com/en-us/azure/databricks/kb/clusters/install-private-pypi-repo
• https://registry.terraform.io/providers/databrickslabs/databricks/latest/docs/resources/global_init_script
• script we use for VMs: https://github.com/microsoft/AzureTRE/blob/main/templates/workspace_services/guacamole/user_resources/guacamole-azure-linuxvm/terraform/pypi_sources_config.sh