Feat: Improved git support - git panel

[devvaannsh]

This PR brings the following features in Git:

1. In the Git more options context menu, added a new command: "Open all changed files", which when clicked opens all the modified/untracked files in the editor. The idea behind this feature is that when AI makes changes to multiple files and user wants to review the changes, they need to open all the files manually by clicking on each one individually which is draining. with this new command its a lot faster and easier.

2. In the git panel, the branch name was not present anywhere which is bad UX as if a user has sidebar collapsed then they won't be able to see the git branch or switch it without opening the sidebar. So, now we add the git branch (and also the toggle support) in the git panel too!

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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