Offence implementations can disable offenders independently from slashing (#10201)

* Offence implementations can disable offenders independently from slashing

* Fix build on CI

* Run cargo fmt

* Fixes based on review comments

* Make parameter naming consistent

* Fix migration and some English

* Fix migration - again

* cargo fmt

* Cover 2 new cases with a test

substrate/frame/offences/src/mock.rs

@@ -36,7 +36,7 @@ use sp_runtime::{
 	Perbill,
 };
 use sp_staking::{
-	offence::{self, Kind, OffenceDetails},
+	offence::{self, DisableStrategy, Kind, OffenceDetails},
 	SessionIndex,
 };
 use std::cell::RefCell;
@@ -55,6 +55,7 @@ impl<Reporter, Offender> offence::OnOffenceHandler<Reporter, Offender, Weight>
 		_offenders: &[OffenceDetails<Reporter, Offender>],
 		slash_fraction: &[Perbill],
 		_offence_session: SessionIndex,
+		_disable_strategy: DisableStrategy,
 	) -> Weight {
 		ON_OFFENCE_PERBILL.with(|f| {
 			*f.borrow_mut() = slash_fraction.to_vec();