depend-o-pocalipse (#9450)

Remove unneeded dependencies and dev-dependencies.
Made self_destruct test not dependent on wasm bin size.  
Updated code related to deprecated warning on tracing-subscriber `scope()` 
( See https://github.com/tokio-rs/tracing/issues/1429 )

substrate/frame/example-parallel/Cargo.toml

@@ -21,9 +21,6 @@ sp-runtime = { version = "4.0.0-dev", default-features = false, path = "../../pr
 sp-std = { version = "4.0.0-dev", default-features = false, path = "../../primitives/std" }
 sp-tasks = { version = "4.0.0-dev", default-features = false, path = "../../primitives/tasks" }
 
-[dev-dependencies]
-serde = { version = "1.0.126" }
-
 [features]
 default = ["std"]
 std = [