I left Google end of 2022, but we already had the mentioned new version of Cider based on VS Code for a few years before that. It's possible FB did it first, but I don't think Google was far behind at all. I'm fairly certain there was the new VSCode based Cider by early 2020. Certainly was by end of 2020 and entirely common by the time I left.

(I didn't get to use it much because I worked on embedded stuff that was on the Chromium stack and in git, not in Google3)

Buganizer (v1 and v2) was delightfully primitive and simple. That was the point. PMs couldn't play games with it.