Change management of test cfg to better support json projects

crates/rust-analyzer/src/global_state.rs

@@ -138,7 +138,6 @@ impl GlobalState {
         // FIXME: Read default cfgs from config
         let default_cfg_options = {
             let mut opts = get_rustc_cfg_options(config.cargo.target.as_ref());
-            opts.insert_atom("test".into());
             opts.insert_atom("debug_assertion".into());
             opts
         };