test: deflake request queue aliases e2e test

`test_rq_aliases` intermittently failed after reboot because the platform's best-effort batch-add can return a request as unprocessed and the singular `add_request` does not retry it. Use `add_requests`, which retries unprocessed requests, so the added requests survive the reboot.

Author: vdusek

tests/e2e/test_actor_request_queue.py

@@ -109,8 +109,11 @@ async def main() -> None:
             assert rq_2.name is None
 
             if not was_rebooted:
-                await rq_1.add_request(Request(url='https://example.com/rq_1', unique_key='rq_1'))
-                await rq_2.add_request(Request(url='https://example.com/rq_2', unique_key='rq_2'))
+                # The platform's batch-add endpoint is best-effort: a single `add_request` can come back
+                # unprocessed (returns `None`) without retrying. Use `add_requests`, which retries unprocessed
+                # requests, so the reboot below never loses a request and the post-reboot fetch is reliable.
+                await rq_1.add_requests([Request(url='https://example.com/rq_1', unique_key='rq_1')])
+                await rq_2.add_requests([Request(url='https://example.com/rq_2', unique_key='rq_2')])
                 await Actor.set_value('was_rebooted', value=True)
                 await Actor.reboot()