Audit fixes for election/staking decoupling part 2 (#8167)

* Base features and traits.

* pallet and unsigned phase

* Undo bad formattings.

* some formatting cleanup.

* Small self-cleanup.

* Make it all build

* self-review

* Some doc tests.

* Some changes from other PR

* Fix session test

* Update Cargo.lock

* Update frame/election-provider-multi-phase/src/lib.rs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

* Some review comments

* Rename + make encode/decode

* Do an assert as well, just in case.

* Fix build

* Update frame/election-provider-multi-phase/src/unsigned.rs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

* Las comment

* fix staking fuzzer.

* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_election_provider_multi_phase --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/election-provider-multi-phase/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Add one last layer of feasibility check as well.

* Last fixes to benchmarks

* Some more docs.

* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_election_provider_multi_phase --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/election-provider-multi-phase/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_election_provider_multi_phase --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/election-provider-multi-phase/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Some nits

* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_staking --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/staking/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Fix doc

* Mkae ci green

* Audit fixes for election-provider: part 2 signed phase.

* Fix weight

* Some grumbles.

* Try and weigh to get_npos_voters

* Fix build

* Fix line width

* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_staking --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/staking/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Fix tests.

* Fix build

* Reorg some stuff

* More reorg.

* Reorg done.

* Fix build

* Another rename

* Fix build

* Update frame/election-provider-multi-phase/src/mock.rs

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

* nit

* better doc

* Line width

* Fix build

* Self-review

* Self-review

* Fix wan

* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_election_provider_multi_phase --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/election-provider-multi-phase/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_staking --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/staking/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* fix build and review comments.

* Update frame/election-provider-multi-phase/src/lib.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* add comment

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Parity Benchmarking Bot <admin@parity.io>
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

substrate/frame/election-provider-multi-phase/src/unsigned.rs

@@ -66,8 +66,17 @@ impl<T: Config> Pallet<T> {
 		let iters = Self::get_balancing_iters();
 		// get the solution, with a load of checks to ensure if submitted, IT IS ABSOLUTELY VALID.
 		let (raw_solution, witness) = Self::mine_and_check(iters)?;
+		let score = raw_solution.score.clone();
+
+		let call: <T as frame_system::offchain::SendTransactionTypes<Call<T>>>::OverarchingCall =
+			Call::submit_unsigned(raw_solution, witness).into();
+		log!(
+			info,
+			"mined a solution with score {:?} and size {}",
+			score,
+			call.using_encoded(|b| b.len())
+		);
 
-		let call = Call::submit_unsigned(raw_solution, witness).into();
 		SubmitTransaction::<T, Call<T>>::submit_unsigned_transaction(call)
 			.map_err(|_| MinerError::PoolSubmissionFailed)
 	}
@@ -413,6 +422,9 @@ mod max_weight {
 		fn on_initialize_open_unsigned_with_snapshot() -> Weight {
 			unreachable!()
 		}
+		fn elect_queued() -> Weight {
+			0
+		}
 		fn on_initialize_open_unsigned_without_snapshot() -> Weight {
 			unreachable!()
 		}
@@ -487,7 +499,7 @@ mod tests {
 	};
 	use frame_support::{dispatch::Dispatchable, traits::OffchainWorker};
 	use mock::Call as OuterCall;
-	use sp_election_providers::Assignment;
+	use frame_election_provider_support::Assignment;
 	use sp_runtime::{traits::ValidateUnsigned, PerU16};
 
 	#[test]