Better logging for movePrimary/moveChunk when error occurs

We currently use the uassertStatusOKWithWarning to log errors that occurred when running moveChunk/movePrimary:

https://github.com/mongodb/mongo/blob/r4.3.2/src/mongo/db/s/move_chunk_command.cpp#L229
https://github.com/mongodb/mongo/blob/r4.3.2/src/mongo/db/s/move_primary_command.cpp#L162

However, these only catches cases when the error is propagated via a returned status. There are a few cases where we use uasserts inside these calls and they won't show up in the log default setting unless it is verbose enough to show assertion messages.