static validateImportedPluginHandler(hubId) {
    const handlerLocation = path.resolve(
      pluginsPath,
      normalizePath(hubId),
      "handler.js"
    );
    return this.isValidLocation(handlerLocation);
  }
/**
Validates if the handler.js file exists for the given plugin.
@param {string} hubId - The hub ID of the plugin.
@returns {boolean} - True if the handler.js file exists, false otherwise.