Enable verification logic when executing benchmarks (#6929)

* Add `--verify` flag to benchmark execution

* make it so `--verify` can be used for getting the actual benchmarks

* undo manual testing

* oops

* use benchmark config struct

* verify is default on, docs update

* remove clone

* improve formatting

* fix test

* bump impl for ci

substrate/frame/staking/src/benchmarking.rs

@@ -715,7 +715,8 @@ mod tests {
 			let closure_to_benchmark =
 				<SelectedBenchmark as frame_benchmarking::BenchmarkingSetup<Test>>::instance(
 					&selected_benchmark,
-					&c
+					&c,
+					true
 				).unwrap();
 
 			assert_ok!(closure_to_benchmark());