remove obsolete trap from waitable-set.wait (#11795)

This was left over from an earlier version of the spec, and I forgot to remove
it.

I've updated the `tests/component-model` submodule to pull in the new
`wait-during-callback.wast` test to exercise this scenario.

Fixes #11781

Signed-off-by: Joel Dice <[email protected]>

Author: dicej

crates/wasmtime/src/runtime/component/concurrent.rs

@@ -2855,10 +2855,6 @@ impl Instance {
         let state = self.concurrent_state_mut(store);
         let task = state.get_mut(guest_task)?;
 
-        if wait && task.callback.is_some() {
-            bail!("cannot call `task.wait` from async-lifted export with callback");
-        }
-
         // If we're waiting, and there are no events immediately available,
         // suspend the fiber until that changes.
         if wait {