Open old version of file in Git side bar.

[Duroktar]

This implements #23011

Hello, this is my first contribution so I'm pretty excited 😄. I do however think the opened file could use a modified title in the editor tab, but would need some guidance to find that setter. Anyways, let me know what you folks think.

Cheers 🍻

[mention-bot]

@Duroktar, thanks for your PR! By analyzing the history of the files in this pull request, we identified @joaomoreno and @bpasero to be potential reviewers.

[msftclas]

@Duroktar,
Thanks for your contribution.
To ensure that the project team has proper rights to use your work, please complete the Contribution License Agreement at https://cla.microsoft.com.

It will cover your contributions to all Microsoft-managed open source projects.
Thanks,
Microsoft Pull Request Bot

[msftclas]

@Duroktar, thanks for signing the contribution license agreement. We will now validate the agreement and then the pull request.

Thanks, Microsoft Pull Request Bot

[joaomoreno]

Thanks! 🍻

[Duroktar]

I'm happy beyond words. What a good feeling to be a part of this, thanks all!