registrar: Avoid freebies in provide_judgement (#12465)

* evaluate repatriate reserved error in pallet identity

* fix benchmarks

* add repatriate reserved error test

* benchmark fix

* undo lock

* include balance to use for benchmarks

* rename test

* Update frame/identity/src/benchmarking.rs

* Update frame/identity/src/benchmarking.rs

Co-authored-by: Bastian Köcher <git@kchr.de>