refactor(l1): replace rlpx listener functions with spawned implementation (#3504)

Remove `spawn_listener` and `spawn_broadcast_listener` functions in
favour of `spawned`'s helper functions for its GenServers.

Note: this PR should not be merged until [related spawned
changes](lambdaclass/spawned#20) are available
on a release.

Closes #3387

Author: juan518munoz

Cargo.toml

@@ -88,9 +88,9 @@ reqwest = { version = "0.12.7", features = ["json"] }
 redb = "=2.4.0"
 snap = "1.1.1"
 secp256k1 = { version = "0.29.1", default-features = false, features = [
-  "global-context",
-  "recovery",
-  "rand",
+    "global-context",
+    "recovery",
+    "rand",
 ] }
 keccak-hash = "0.11.0"
 axum = "0.8.1"

crates/l2/tee/quote-gen/Cargo.lock

@@ -18,7 +18,7 @@ let
     cargo = toolchain;
     rustc = toolchain;
   };
-  gitignoreSrc = pkgs.fetchFromGitHub { 
+  gitignoreSrc = pkgs.fetchFromGitHub {
     owner = "hercules-ci";
     repo = "gitignore.nix";
     rev = "637db329424fd7e46cf4185293b9cc8c88c95394";