The connection-status probe and the access-review driver each had
their own copy of the "try us.posthog.com, then eu.posthog.com"
region-discovery loop, and they drifted. The driver skips a region
that rejects the token (wrong region) and uses the one that answers
2xx; the probe instead returned "credential rejected" on the first
region's 401/403, before ever trying the second.
PostHog Cloud US and EU are separate deployments, so an EU OAuth
token is a 401 on us.posthog.com, which is probed first. The probe
bailed there and marked the source disconnected, while access-review
campaigns -- which use the driver -- kept working.
Delete the probe's copy and delegate to the driver's now-exported
ResolvePostHogRegion, the single resolver the campaign also uses. It
flags a credential every region rejected (ErrPostHogCredentialRejected)
apart from a transient failure on the token's own region, so the probe
marks a source disconnected only for a genuinely dead token and does
not flap on a passing 5xx.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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