style: Migrate to stable-only rustfmt configuration

- Remove nightly-only features from .rustfmt.toml and vendor/ss58-registry/rustfmt.toml
- Removed features: imports_granularity, wrap_comments, comment_width,
  reorder_impl_items, spaces_around_ranges, binop_separator,
  match_arm_blocks, trailing_semicolon, trailing_comma
- Format all 898 affected files with stable rustfmt
- Ensures long-term reliability without nightly toolchain dependency

pezcumulus/zombienet/zombienet-sdk/tests/zombie_ci/bootnodes.rs

@@ -6,7 +6,7 @@ use tokio::time::Duration;
 
 use crate::utils::initialize_network;
 
-use pezcumulus_zombienet_sdk_helpers::{wait_for_nth_session_change};
+use pezcumulus_zombienet_sdk_helpers::wait_for_nth_session_change;
 use zombienet_orchestrator::network::node::LogLineCountOptions;
 use zombienet_sdk::{
 	subxt::{OnlineClient, PezkuwiConfig},
@@ -30,7 +30,9 @@ async fn build_network_config() -> Result<NetworkConfig, anyhow::Error> {
 				// Have to set a `with_node` outside of the loop below, so that `r` has the right
 				// type.
 				.with_validator(|node| node.with_name("validator-0"));
-			(1..3).fold(r, |acc, i| acc.with_validator(|node| node.with_name(&format!("validator-{i}"))))
+			(1..3).fold(r, |acc, i| {
+				acc.with_validator(|node| node.with_name(&format!("validator-{i}")))
+			})
 		})
 		.with_teyrchain(|p| {
 			p.with_id(1000)