The extension displays a wrong task name when open a multi root workspace

The multiple root structure:

• a maven project such as spring-petclinic
• a nodejs project

When opening multi root workspace in VS Code, the extension will show "Importing Maven projects" on node_modules folder.

The actual task for the node_modules is the maven scan task. The task name seems a stale name from the previous importer. The importer for each root shared the same progress reporter. The scan task for the second root didn't update the task name, so it reused the previous task name.

首先跟踪多根工作区导入器以及每个扫描任务使用的共享进度报告器。复现 issue 中描述的 Maven 和 Node.js 根，然后验证每个根的扫描是否显示其自己的任务名称，而不是重复使用前一个导入器的名称。