Azure DevOps integration for git related promotion steps

[diegocaspi]

Checklist

• I've searched the issue queue to verify this is not a duplicate feature request.
• I've pasted the output of kargo version, if applicable.
• I've pasted logs, if applicable.

Proposed Feature

Add native Azure DevOps integration for the following steps in Kargo:

1. git-open-pr: Support creating pull requests for repositories hosted on Azure DevOps.
2. git-wait-for-pr: Support waiting for pull requests to be approved and merged within Azure DevOps.

Motivation

Currently, Kargo provides support for managing Git operations (such as creating and monitoring pull requests) via its git-open-pr and git-wait-for-pr steps. However, these steps seem to lack native support for Azure DevOps, which limits the tool’s usability for teams leveraging this platform for Git hosting and CI/CD workflows.

As Azure DevOps is a widely used tool for Git repository management, adding support for these steps would enhance Kargo’s versatility and make it more appealing to a broader user base.

Suggested Implementation

Add the azure git provider inside internal/gitprovider folder.

Notes

I'm already working on a PR for a first implementation.