[to be closed, replaced by smaller, more focused MRs] Propose simplified review process for green field features

What does this MR do and why?

This MR suggests a simplified code-review process that could help teams who work on large green field features.

The motivation for this MR

A new feature (e.g. Remote Development, AI Code Suggestions) can reach a threshold where it's too big for a Proof of Concept MR/branch, and so you have to start the implementation. But at the same time, you are certain you'll change the code design and dependencies (systems, libraries) a few more times before you are ready to enable the feature flag. At this point, our review process isn't best suited for the large influx of MRs that write and rewrite the feature.