[Improve] Optimize task description display

[zhangshenghang]

Purpose of this pull request

Optimize task description display

Before:

After:

Check list

• Code changed are covered with tests, or it does not need tests for reason:
• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs