fix(resolver): stop redirect chain when external url found
fix(resolver): stop redirect chain when external url found

e.g. with those two redirects:
(1) /child-infant-mortality --> https://somesite.com/child-mortality-old
(2) /child-mortality-old --> /child-mortality

we want to stop the lookup at (1) and resolve to https://somesite.com/child-mortality-old, despite a matching pathname in (2) (but with a different implied origin)

owid/owid-grapher,owid/owid-grapher,owid/owid-grapher,owid/owid-grapher,owid/owid-grapher