Possible workflow change

[elibarzilay]

(This was suggested a while ago by @andrewbranch.)

PRs that currently go to "Need Maintainer Review" can all be "blessed away" from it, making them (usually) go to "Waiting for Code Reviews". As another step towards more self-managing, it could instead do the following with these PRs:

• Start in WfCR, same as PRs that don't require a maintainer review,
• Wait for approval (as usual),
• Possibly offer to "ready to merge",
• And when all that's done, instead of merging it directly, wait for a maintainer to merge after eye-balling whatever required a maintainer in the first place.

More notes:

• The ready-to-merge offer will be different of course, saying that it just require a maintainer to merge.

• If no reviews come in, then it will stale out as usual (which means moving to the maintainers too).

• A related option: do the same for no-other-owner PRs, with a note saying that it will end up in the maintainer queue after a while. This should encourage people looking for additional maintainers, which should reduce the number of maintainer-required work.