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/test-utils/test-runner/src/utils.rs

@@ -108,7 +108,6 @@ pub fn default_config(tokio_handle: Handle, mut chain_spec: Box<dyn ChainSpec>)
 		base_path: Some(base_path),
 		wasm_runtime_overrides: None,
 		informant_output_format,
-		disable_log_reloading: false,
 		keystore_remote: None,
 		keep_blocks: KeepBlocks::All,
 		state_pruning: Default::default(),