Enable linear version of `groups_including_descendants_by`
What does this MR do and why?
In this MR, we're switching the behavior of two methods in Group.groups_including_descendants_by
to use the linear version. The new behavior is behind the linear_group_including_descendants_by
feature flag.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #339431 (closed)
Edited by Francisco Javier López