tests/substrate: Remove outdated substrate specific conformace testing (#370)

The substrate/conformance testing was hidden behind a
`custom_sc_network` feature flag.

However, the code relied on the `custom-sc-network` feature flag (`-`
instead of `_`). Because this feature never existed, the tests quickly
became out of date.

Furthermore, upon inspection many internal structures exposed by
`sc-network` were either removed or made private.
Instead, they should live in substrate and are effectively replaced by:
- paritytech/polkadot-sdk#7361
- paritytech/polkadot-sdk#7484

Closes: #353

cc @paritytech/networking

---------

Signed-off-by: Alexandru Vasile <[email protected]>

Author: lexnv

Cargo.lock

@@ -58,7 +58,6 @@ ring = { version = "0.16.20", optional = true }
 webpki = { version = "0.22.4", optional = true }
 
 [dev-dependencies]
-asynchronous-codec = "0.7.0"
 libp2p = { version = "0.51.4", features = [
     "tokio",
     "dns",
@@ -74,15 +73,11 @@ libp2p = { version = "0.51.4", features = [
     "quic",
 ]}
 quickcheck = "1.0.3"
-rand_xorshift = "0.3.0"
-sc-network = "0.48.1"
-sc-utils = "17.0.0"
 serde_json = "1.0.122"
 tracing-subscriber = { version = "0.3.16", features = ["env-filter"] }
 futures_ringbuf = "0.4.0"
 
 [features]
-custom_sc_network = []
 quic = ["dep:webpki", "dep:quinn", "dep:rustls", "dep:ring"]
 webrtc = ["dep:str0m"]
 websocket = ["dep:tokio-tungstenite"]

Cargo.toml

@@ -20,5 +20,3 @@
 
 #[cfg(test)]
 mod rust;
-#[cfg(test)]
-mod substrate;