ruby: Remove UserRebaseConfirmable implementation
In [1] we removed all code to call the Ruby implementation of UserRebaseConfirmable. This happened in the previous minor release so now it's time to remove the Ruby implementation completely.
- 8f557457 (UserRebaseConfirmable: Remove feature flag, 2021-05-31)
This is the last step in porting this RPC to Go.
Closes #3575 (closed)
Edited by Toon Claes