Feature Request

Is your feature request related to a problem? Please describe:

Add an option that BR can remove pd leader related scheduler automatically. just like restore does
In our test:
with balance leader scheduler cost: 9m33s
without balance leader scheduler cost: 2m31s

this could happen because there are so many incomplete retry when leader transfer.

Describe the feature you'd like:

Add an option that can remove scheduler automatically to speed up backup.

Describe alternatives you've considered:

This change has some impact on backup cluster.so we can set default value to false.

Teachability, Documentation, Adoption, Migration Strategy: