Disable flaky test (async signals); less verbose unzip

Author: Bromeon

.github/composite/godot-install/action.yml

@@ -51,7 +51,7 @@ runs:
         fi
         
         curl "$url" -Lo artifact.zip --retry 3
-        unzip artifact.zip -d $RUNNER_DIR/godot_bin
+        unzip -q artifact.zip -d $RUNNER_DIR/godot_bin
       shell: bash
 
     - name: "Prepare Godot executable"

itest/rust/src/engine_tests/async_test.rs

@@ -160,8 +160,9 @@ fn signal_future_non_send_arg_panic() -> TaskHandle {
     handle
 }
 
+// FIXME test is flaky and occasionally breaks CI job `linux-features-experimental`. Should become deterministic, then un-skip.
 #[cfg(feature = "experimental-threads")]
-#[itest(async)]
+#[itest(async, skip)]
 fn signal_future_send_arg_no_panic() -> TaskHandle {
     use crate::framework::ThreadCrosser;