Define mechanism to ensure PRs are moved quickly after approval

[makubacki]

It is often a problem that code is approved and ready for completion but it is not clear who is supposed to actually push the code. The goal of this task is to define a process that makes it clear what happens and prevents this unnecessary gap in the contribution process.

[makubacki]

@mdkinney, I don't recall a resolution being reached on this topic.

[mdkinney]

The first approach will be same as today. One of the maintainers will have to notice that all of the required reviews for the entire PR have been completed and that all CI checks pass and that all conversations are resolved and set the "push" label.

We are open to adding more automation and process, but no clear direction on that at this time.