Missing callback on ahead behind changing.

[chris-addison]

Prerequisites

• Be sure to run with tracing enabled to capture runtime details in the log file
• Include the log file in the PR.
  • On Windows, the extension log file is at %LOCALAPPDATA%\GitHubUnity\github-unity.log
  • On macOS, the extension log file is at ~/Library/Logs/GitHubUnity/github-unity.log
  • On linux, the extension log file is at ~/.local/share/GitHubUnity/github-unity.log

Description

Ahead and behind updating via git fetch are not sending the Environment.Repository.TrackingStatusChanged event.

Steps to Reproduce

1. register a simple logging handler to Environment.Repository.TrackingStatusChanged
2. Push a new commit to remote from another local checkout
3. Call git fetch from G4U
4. Observe no callback.

Expected behavior: Callback should occur.
Actual behavior: Nothing.

Reproduces how often: 100% of the time.

Additional Information

Any additional information, configuration or data that might be necessary to reproduce the issue.