Disable log reloading by default (#9966)

* Disable log reloading by default

This disables the log reloading that was enabled by default. The problem
is that the log reload implementation of `tracing` is using a lock to
make the layer replaceable. This lock needs to be locked every time we
need to check if a particular target is enabled (assuming the log level
is high enough). This kills the performance when for example
`sometarget=trace` logging is enabled.

* 🤦

* Remove unused parameter

* Fix test

* Fix

substrate/client/service/src/config.rs

@@ -118,8 +118,6 @@ pub struct Configuration {
 	pub dev_key_seed: Option<String>,
 	/// Tracing targets
 	pub tracing_targets: Option<String>,
-	/// Is log filter reloading disabled
-	pub disable_log_reloading: bool,
 	/// Tracing receiver
 	pub tracing_receiver: sc_tracing::TracingReceiver,
 	/// The size of the instances cache.