Feature flags handling related to removal of HGitaly1 mode
The first changeset is needed for the tests to pass on Heptapod 0.29
This instance will be upgraded to Heptapod 18.0.1 on 2025-07-10 between 14:00 and 15:00 UTC+2
The first changeset is needed for the tests to pass on Heptapod 0.29