SG-40595 Change Git access to HTTPS using a Github App

[julien-lang]

This PR changes the way CI scripts access Git repositories.

First it nows uses HTTPS instead of SSH. For making that happens, we create a Git credential manager for the session. The manager simply reads the GH_ACCESS_TOKEN environment variable.

Then, we use the Github Rest API to generate a App Installation Access Token. This token is only valid for 2 hour.

[Copilot]

Pull Request Overview

This PR migrates authentication from SSH keys to GitHub App tokens for Git operations in Azure DevOps pipelines. The change introduces a Python script to generate GitHub App access tokens and updates the configuration update process to use HTTPS with token-based authentication instead of SSH.

• Replaces SSH-based Git authentication with GitHub App token authentication
• Adds Python script to generate GitHub App installation tokens using JWT
• Updates Git configuration to use GitHub App credentials instead of hardcoded user details

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
internal/update-configuration.yml	Adds GitHub App token generation script and updates Git authentication method
internal/release-to-appstore.yml	Adds TODO comment about migrating SSH clone to new authentication method
azure-pipelines.yml	Adds GitHub App variable group with concern about manual addition to all repos

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[carlos-villavicencio-adsk]

LGTM