Revert "gossiper: check for a race condition in do_apply_state_locally"

This reverts commit 13392a40d4 as per
request from #25803

gms/gossiper.cc

@@ -621,13 +621,6 @@ future<> gossiper::do_apply_state_locally(locator::host_id node, endpoint_state
     // If there is a generation tie, attempt to break it by heartbeat version.
     auto permit = co_await lock_endpoint(node, null_permit_id);
     auto es = get_endpoint_state_ptr(node);
-
-    // If remote state update does not contain a host id, check whether the endpoint still
-    // exists in the `_endpoint_state_map` since after a preemption point it could have been deleted.
-    if (!remote_state.get_host_id() && !es) {
-        throw std::runtime_error(format("Entry for host id {} does not exist in the endpoint state map.", node));
-    }
-
     if (es) {
         endpoint_state local_state = *es;
         auto local_generation = local_state.get_heart_beat_state().get_generation();

test/cluster/test_gossiper_race.py

@@ -15,6 +15,7 @@ from test.pylib.manager_client import ManagerClient
 
 @pytest.mark.asyncio
 @skip_mode('release', 'error injections are not supported in release mode')
+@pytest.mark.xfail(reason="https://github.com/scylladb/scylladb/issues/25621")
 async def test_gossiper_race_on_decommission(manager: ManagerClient):
     """
     Test for gossiper race scenario (https://github.com/scylladb/scylladb/issues/25621):