The us/eu host strings lived in the driver and were duplicated in the
connector-settings resolver. Expose drivers.PostHogRegionBaseURL as the
single source and call it from the resolver.
Also parse the base URL only inside the absolute-next branch of
resolveNextURL, where it is actually used for the host check.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
e4f247a20d