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urlutil: provide some information about "bad url" when processing `pushurl`

Authored by marmoute.

Description

urlutil: provide some information about "bad url" when processing pushurl

It appears pushurl only support <proto>:// entries. This is not obvious and
can lead to obscure error. We make the error less obscure as a start..

Differential Revision: https://phab.mercurial-scm.org/D10455