[openstreetmap/openstreetmap-website] Discard jobs when then encounter a deserialization error (PR #4323)

[Tom Hughes]

> [The docs for `ActiveJob:DeserializationError`](https://edgeapi.rubyonrails.org/classes/ActiveJob/DeserializationError.html) suggest that the original error is available wrapped within that one, so perhaps it might be possible to discard only the jobs that raise a NotFound error during deserialization?

I was starting to think that it wasn't possible because there's no way to attach a condition to `on_discard` to inspect the contents but then I looked at how it's implemented and it comes down to https://github.com/rails/rails/blob/6b93fff8af32ef5e91f4ec3cfffb081d0553faf0/activesupport/lib/active_support/rescuable.rb#L90 which, if it doesn't find a handle for `exception` will look for one for `exception.cause` instead which is just what we need!

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