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/primitives/utils/Cargo.toml

@@ -11,7 +11,6 @@ readme = "README.md"
 
 [dependencies]
 futures = "0.3.9"
-futures-core = "0.3.4"
 lazy_static = "1.4.0"
 prometheus = { version = "0.11.0", default-features = false }
 futures-timer = "3.0.2"