refactor: remove unused mockall, fix flaky tests (#634)

Removes unused mockall dependency from desktop/src-tauri/Cargo.toml. Flaky test fixes already landed via #631.

Author: AlexMikhalev

desktop/src-tauri/Cargo.toml

@@ -67,7 +67,7 @@ lru = "0.16"
 tokio-test = "0.4.4"
 serial_test = "3.3.1"
 tempfile = "3.23.0"
-mockall = "0.14.0"
+
 
 [features]
 # by default Tauri runs in production mode