Fixes #4062: Prevent an upgrade failure in case of a property modification reverted by a package upgrade
Fixes #4112: Prevent the upgrade to Rudder 2.8 from breaking due to an incompatible Technique/Promise
Merge pull request #171 from Kegeruneku/bug_4062/int/4062_correct_migration_after_2_6_upgrade

Fixes #4062: Prevent an upgrade failure in case of a property modificati...
Merge pull request #169 from Kegeruneku/bug_4110/int/4110_restore_init_promises_on_2_8_non_accepted_upgrades

Fixes #4112: Prevent the upgrade to Rudder 2.8 from breaking due to an i...