More easily see what extension flagged a problem

[wbt]

Sometimes, problems stay flagged as problems far longer than they should, even after they've been fixed.
In this issue, the idea of a refresh button on the problems pane was rejected with instructions to file an issue on the extension which keeps the problem around too long. The problem is then: of the many installed extensions, which one flagged this issue? I don't see how to figure that out from the current interface beyond reasoned-guess-and-check, but there should be an easier way to find that within the Problems display.

[gjsjohnmurray]

Previously requested in #141987

[sandy081]

/duplicate