Simplify the code - remove sync functions

[jacopo-chevallard]

Currently, we maintain two versions of the functions/methods called by our services, an async one and a sync one. This creates significant redundancies in the code base, and slows down further developments.

With the next iterations, we will progressively remove the sync versions and only maintain and use the async ones (which are, already, the only ones used in our prod environments/deployments)

[linear]

CORE-205 Simplify the code - remove sync functions