[Rpm-maint] [rpm-software-management/rpm] Add error messages for url helper calls (PR #3041)

[Panu Matilainen]

There should be a test for the case where the urlhelper is missing - it's what we can easily test, and also happens to be the case we're also most interested in for the bug.

> $ ./tools/rpm --define "_urlhelper /not/there" -qp https://ftp.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/updates/39/Everything/x86_64/Packages/3/389-ds-base-snmp-2.4.5-1.fc39.x86_64.rpm
error: Could not find url helper: "/not/there"
error: open of https://ftp.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/updates/39/Everything/x86_64/Packages/3/389-ds-base-snmp-2.4.5-1.fc39.x86_64.rpm failed: No such file or directory

Like I said (elsewhere), I've poked at this thing before. And I remember now, the reason I abandoned it was because I didn't like the "improved" behavior that great either -  the latter message is pretty misleading even if the reason is in the line above.

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