Flaky agent_await_parallel_rpc_calls test

[vigoo]

This test often fails on CI with

2026-04-14T07:46:24.6855547Z     0: 0x11401db - <unknown>!<wasm function 171>
2026-04-14T07:46:24.6855958Z     1:  0x95e99 - agent_guest.wasm!wasip2::imports::wasi::io::poll::poll::hb4089889d6bf1574
2026-04-14T07:46:24.6856510Z     2: 0x1f4214 - agent_guest.wasm!wstd::runtime::reactor::Reactor::nonblock_check_pollables::he40465910c1113e2
2026-04-14T07:46:24.6857116Z     3: 0x1f604b - agent_guest.wasm!agent_guest::bindings::exports::golem::agent::guest::_export_invoke_cabi::haa7c5cdd4c14a0b5
2026-04-14T07:46:24.6857767Z     4: 0x1f4d2a - agent_guest.wasm!golem:agent/guest@1.5.0#invoke: resource is of another type
2026-04-14T07:46:24.6858363Z     golem-worker-executor/src/worker/invocation_loop.rs:251

but could not reproduce locally yet. It seems to be a critical issue