Suggested timeline changes

[elibarzilay]

YSYL timeline:

(Currently one week => NMA; changes to one month => closed.)

• Measure time from when the PR became mergable (excluding comments etc)
• Wait a week
• Post a ping comment for author (+ owners) with a "JFYI will be closed in 3 weeks if not merged"
• Wait three more weeks (so the total time changes from a week to a month)
• not merged yet: apply YSYL label and close it
  (this is a change from the previous behavior of putting it on the maintainer NMA queue)

Unreviewed timeline:

(Currently one month => NMA; changes to two weeks => NMA.)

• Measured from the creation time (including a draft->ready change, or a closed-and-reopened)
• The PR is on either waiting-for-reviews or needs-maintainer-review if there's something to pay attention to
  (in the can be blessed away from NMR to WFR)
• Wait 10 days
• Post an "unreviewed for over a week" re-ping comment for reviewers
  (do not mention that it will go to NMA, to avoid laziness)
• Wait 1 week
• Put on NMA (where a maintainer needs to do something)

[orta]

Yeah, agree, this sounds good 👍🏻