Prepare UI tests for rust 1.55 (#9637)

* Prepare UI tests for rust 1.54

* Delete wrong_page.stderr

* CI: run with a staging CI image

* Revert "CI: run with a staging CI image"

This reverts commit 66f5b00d14b50fd9d8fbf773f7e884f380697591.

* CI: debug, again

* LOG_TARGET is only used in std

* Remove unnecessary unsafe

* Fixes

* Use correct rustc locally

* FMT

* Compile with benchmarking

* Review feedback

* Some ui tests

* I know...

* Fix wasm tests

Co-authored-by: Denis P <denis.pisarev@parity.io>
Co-authored-by: thiolliere <gui.thiolliere@gmail.com>

substrate/client/executor/src/native_executor.rs

@@ -101,8 +101,6 @@ pub struct WasmExecutor {
 	host_functions: Arc<Vec<&'static dyn Function>>,
 	/// WASM runtime cache.
 	cache: Arc<RuntimeCache>,
-	/// The size of the instances cache.
-	max_runtime_instances: usize,
 	/// The path to a directory which the executor can leverage for a file cache, e.g. put there
 	/// compiled artifacts.
 	cache_path: Option<PathBuf>,
@@ -138,7 +136,6 @@ impl WasmExecutor {
 			default_heap_pages: default_heap_pages.unwrap_or(DEFAULT_HEAP_PAGES),
 			host_functions: Arc::new(host_functions),
 			cache: Arc::new(RuntimeCache::new(max_runtime_instances, cache_path.clone())),
-			max_runtime_instances,
 			cache_path,
 		}
 	}