Revalidate PRs from users whose profile is updated

[plehegar]

The system answers:
[[
User foobar is known to the system. You can edit that account.
]]

when the user pull request is classified as "unknown".

That's because the association with the W3C account is missing.

We should improve the message...

[dontcallmedom]

actually, the problem is a bit different than described: at the time where the status of the PR was set (assuming we're talking about PR 131 of IntersectionObserver), the user was indeed unknown to the system. Once you started adding them, they are no longer unknown; it happens that the PR is still not right since the user is not affiliated to the group, but if you were to revalidate the PR, I think it would show the right message.

That being said, I think ideally, ash-nazg would revalidate automatically all the open PRs in which someone is a contributor when their info is created/updated.