fixes #19087 - create host built notification from Host#built #4424
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Comparing the host's installed_at timestamp is unreliable on MySQL
databases, as the timestamp field has a limited granularity. Under Rails
5 in a sub-second test, this field will not be changed.
Instead, extend Host#built to create notifications as the original
method is also used to send e-mail notifications and update the
installed_at field.