If we’ve recently discovered that a phone number can’t be discovered,
there isn’t much benefit to checking again.
However, for other parts of the migration flow, we still want to
consider such users. For example, sometimes we want to require all users
to have a UUID to perform a migration. Before this change, we might
return a false positive after performing a CDS lookup since we wouldn’t
check whether or not recently undiscoverable users have a UUID.
In another case, we’re intentionally excluding users without UUIDs. In
this case, the end result is the same whether we drop them during the
first pass or the second pass, but the intent is more clear if we drop
all such users during the second pass.
Lastly, we want to fetch profiles even for undiscoverable users, even
though this operation is likely to fail.
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