Azure DevOps: add support for pull_request_template.md

we are using pull_request_template.md files.  when creating a pull request, if this file is present, the PR should include this content

I wanted to update this with a link:

Improve pull request descriptions with pull request templates - Azure Repos | Microsoft Learn

I see there is a similar request. here:
Support GitHub PR Templates / General / SmartGit (userecho.com)

The templates are in different files, but the 'ask' is probably the same. I should point this feature is extremely important for companies that have compliance / ISO workflows... The create PR feature from within smart git is not very useful if you have to 'copy paste' the template after the PR is made.