Remove SetConfig/DeleteConfig RPCs
Upstream callers of SetConfig/DeleteConfig have been removed. After gitlab#337002 (closed) is full rolled out in %14.3, we can remove the now-deprecated RPCs in %14.4.
Upstream callers of SetConfig/DeleteConfig have been removed. After gitlab#337002 (closed) is full rolled out in %14.3, we can remove the now-deprecated RPCs in %14.4.