All calls are effectively synchronous, because the tool doesn't exit until it gets a response even in async mode. Yet we maintain two separate code paths: one for --sync-call/cib_sync_call, and one that uses a main loop.
This task is to deprecate the --sync-call CLI option and use the cib_sync_call code path unconditionally.
Ref: https://github.com/ClusterLabs/pacemaker/pull/3403#discussion_r1580492741
This is an easy change but I don't want to grow CLPR#3403 further.