Feature: Use Github integration user for git actions

[natifridman]

Jira: RHOAIENG-51918

🚀 Feature Description

Is your feature request related to a problem?
Currently ambient is using the GitHub App bot user for git operations such as commit messages.
We could act as the user used for the GitHub integration

💡 Proposed Solution

Detailed Description: Use the authenticated GitHub user instead of the GitHub App bot account

User Experience: Using the GitHub integration

🎯 Use Cases

Primary Use Case: Who will use this and why?

User Stories:

• For feature development and commit history, it should be clear who made the change

[github-actions]

Inactive for 30 days. Will close in 7 days unless there's activity.

[jeremyeder]

Closing — superseded by #935 which has a thorough design for user-to-server OAuth tokens that covers this use case.