Summary:
Fast backward scan feature in not yet stable. For example, some deleted rows are returned as
alive in some cases: https://github.com/yugabyte/yugabyte-db/issues/26060.
The feature should be disable in 2.25.1 by default as of now.
Jira: DB-15402

Test Plan: Jenkins

Reviewers: rthallam

Reviewed By: rthallam

Subscribers: ybase

Tags: #jenkins-ready, #jenkins-trigger

Differential Revision: https://phorge.dev.yugabyte.com/D41958