Share PostHog region mapping and tidy pagination

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>

pkg/server/api/console/v1/connector_settings.go

@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"net/url"
 
+	"go.probo.inc/probo/pkg/accessreview/drivers"
 	"go.probo.inc/probo/pkg/coredata"
 	"go.probo.inc/probo/pkg/server/api/console/v1/types"
 )
@@ -98,7 +99,7 @@ func apiKeyConnectorSettings(input types.CreateAPIKeyConnectorInput) (json.RawMe
 			return nil, fmt.Errorf("cannot create posthog connector: posthogRegion is required")
 		}
 
-		baseURL, ok := posthogRegionBaseURL(*input.PosthogRegion)
+		baseURL, ok := drivers.PostHogRegionBaseURL(*input.PosthogRegion)
 		if !ok {
 			return nil, fmt.Errorf("cannot create posthog connector: posthogRegion must be US or EU")
 		}
@@ -120,20 +121,6 @@ func apiKeyConnectorSettings(input types.CreateAPIKeyConnectorInput) (json.RawMe
 	return nil, nil
 }
 
-// posthogRegionBaseURL maps a PostHog Cloud region selector to its data-API
-// base host. Only US and EU clouds exist; self-hosted instances use the
-// dedicated POSTHOG_SELF_HOSTED provider with a full instance URL instead.
-func posthogRegionBaseURL(region string) (string, bool) {
-	switch region {
-	case "US", "us":
-		return "https://us.posthog.com", true
-	case "EU", "eu":
-		return "https://eu.posthog.com", true
-	default:
-		return "", false
-	}
-}
-
 // clientCredentialsConnectorSettings marshals the provider-specific
 // extra settings for a client-credentials connector. See
 // apiKeyConnectorSettings for the error contract.