Update ADO Pipeline instructions

[SimonWahlin]

Overview/Summary

Update script in wiki to use ADOPS PowerShell module.
Fixes #750
Fixes #753

This PR fixes/adds/changes/removes

1. Update wiki documentation for Azure Pipelines setup

Testing Evidence

Ran code to create a new Project, repository, pipelines, variable groups, settings and policies. Tested running the push pipeline which ran successfully.

As part of this Pull Request I have

• Checked for duplicate Pull Requests
• Associated it with relevant issues, for tracking and closure.
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Updated relevant and associated documentation.

[daltondhcp]

Seems to be working fine after installing the AzAuth module manually. As discussed offline, awaiting update of the ADOPS module to include this as a required module.

[daltondhcp]

🚢