Route connect OAuth through unified sign-in

Drop the portal-login redirect, accept continue URLs for magic links,
brand emails from the OAuth client when present, and update e2e coverage.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/server/api/complianceportal/v1/auth_resolvers.go

@@ -38,7 +38,7 @@ func (r *mutationResolver) SendMagicLink(ctx context.Context, input types.SendMa
 	req := &iam.SendMagicLinkRequest{
 		Email:            input.Email,
 		CompliancePageID: &trustCenter.ID,
-		OrganizationID:   trustCenter.OrganizationID,
+		OrganizationID:   &trustCenter.OrganizationID,
 		URLPath:          "verify-magic-link",
 		Continue:         input.Continue,
 	}