[Improve][CDC] Close idle subtasks gorup(reader/writer) in increment phase

[hailin0]

Purpose of this pull request

[CDC] Close idle subtasks gorup(reader/writer) in increment phase

Does this PR introduce any user-facing change?

No

How was this patch tested?

added https://github.com/apache/seatunnel/pull/6526/files#diff-198d9ea0204d7713e1623ecd32a24c516808b469f8f792211e3f71b0a101b385R421

https://github.com/apache/seatunnel/pull/6526/files#diff-5f0bf5f7076dac7f98979b1221bd1be4e3c24926beb6322d987a06a9a8b6b2e3R229

Check list

• [ ] 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
• [ ] If you are contributing the connector code, please check that the following files are updated:
  1. Update change log that in connector document. For more details you can refer to connector-v2
  2. Update plugin-mapping.properties and add new connector information in it
  3. Update the pom file of seatunnel-dist
• [ ] Update the release-note.

[dailai]

Good job.