fix(npm): Don't skip lockfile-only updates (#33497)

lib/modules/manager/npm/post-update/index.ts

@@ -370,14 +370,6 @@ export async function getAdditionalFiles(
     logger.debug('Skipping lock file generation');
     return { artifactErrors, updatedArtifacts };
   }
-  if (
-    config.reuseExistingBranch &&
-    !config.updatedPackageFiles?.length &&
-    config.upgrades?.every((upgrade) => upgrade.isLockfileUpdate)
-  ) {
-    logger.debug('Existing branch contains all necessary lock file updates');
-    return { artifactErrors, updatedArtifacts };
-  }
   logger.debug('Getting updated lock files');
   if (
     config.updateType === 'lockFileMaintenance' &&