refac: DELETE /v1/user/{id}?expected_role_id=N, user.remove audit event, 409 target_role_not_found, GetAll returns its error, Own-scope visibility filter moved into repos, JSON tags removed from use-case types

test/api_catalogue_drift_test.go

@@ -51,6 +51,7 @@ func routerRoutes(t *testing.T) map[string]bool {
 
 var routesNotYetInTheCatalogue = []string{
 	"DELETE /v1/role/{id}",
+	"DELETE /v1/user/{id}",
 	"GET /v1/user/lookup",
 	"GET /v1/permission",
 	"GET /v1/role",