ebs br: use minimum warmup to speed up the restore RTO

[BornChanger]

Feature Request

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

Describe the feature you'd like:

We need to provide an option to minimize the ebs snapshot restore RTO. That is use the minimal warmup effort to bring up TiKV nodes and sync up regions instantly.

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: