shutdown the near_event_monitor gracefully

[en]

Summary of Bug

After the test is complete, the channel will be closed.
The near_event_monitor still sends messages

2023-10-11T08:55:13.332643Z  INFO worker.batch{chain=ibc-2}:supervisor.handle_batch{chain=ibc-2}:supervisor.process_batch{chain=ibc-2}:worker.packet.cmd{src_chain=ibc-2 src_port=transfer src_channel=channel-0 dst_chain=near-0}:relay{odata=312eb096 ->Destination @2-360; len=1}: ibc_relayer::link::operational_data: assembled batch of 2 message(s)
2023-10-11T08:55:13.332955Z  INFO worker.batch{chain=ibc-2}:supervisor.handle_batch{chain=ibc-2}:supervisor.process_batch{chain=ibc-2}:worker.packet.cmd{src_chain=ibc-2 src_port=transfer src_channel=channel-0 dst_chain=near-0}:relay{odata=312eb096 ->Destination @2-360; len=1}: ibc_relayer::chain::near: proto_msgs: ["/ibc.core.client.v1.MsgUpdateClient", "/ibc.core.channel.v1.MsgAcknowledgement"], tracking_id: Uuid(312eb096-4025-4d50-bdb4-1cbc0137a707) 
crates/relayer/src/chain/near/mod.rs:555:13
2023-10-11T08:55:16.018306Z  WARN event_monitor{chain=near-0}: ibc_relayer::event::near_event_monitor: querying ibc events at height: [141265163]
2023-10-11T08:55:16.278558Z  WARN event_monitor{chain=near-0}: ibc_relayer::chain::near::rpc::tool: get_name_from_module_event_attributes: ""
2023-10-11T08:55:16.278614Z  WARN event_monitor{chain=near-0}: ibc_relayer::chain::near::rpc::tool: get_name_from_module_event_attributes: ""
2023-10-11T08:55:16.278650Z  WARN event_monitor{chain=near-0}: ibc_relayer::event::near_event_monitor: ibc events found at height 141265163: EventBatch { chain_id: ChainId { id: "near-0", version: 0 }, tracking_id: Uuid(f4c5b7ca-f9b1-4734-9fc8-3719e5f37666), height: Height { revision: 0, height: 141265163 }, events: [IbcEventWithHeight { event: Message("ibc_client"), height: Height { revision: 0, height: 141265163 } }, IbcEventWithHeight { event: UpdateClient(UpdateClient { common: Attributes { client_id: ClientId("07-tendermint-317"), client_type: Tendermint, consensus_height: Height { revision: 2, height: 361 } }, header: None }), height: Height { revision: 0, height: 141265163 } }, IbcEventWithHeight { event: Message("ibc_channel"), height: Height { revision: 0, height: 141265163 } }, IbcEventWithHeight { event: AcknowledgePacket(AcknowledgePacket { packet: Packet { sequence: Sequence(2), source_port: PortId("transfer"), source_channel: ChannelId("channel-232"), destination_port: PortId("transfer"), destination_channel: ChannelId("channel-0"), data: [], timeout_height: Never, timeout_timestamp: Timestamp { time: Some(Time(2023-10-11 9:11:26.581892208)) } } }), height: Height { revision: 0, height: 141265163 } }, IbcEventWithHeight { event: AppModule(ModuleEvent { kind: "fungible_token_packet", module_name: ModuleId("transfer"), attributes: [ModuleEventAttribute { key: "module", value: "transfer" }, ModuleEventAttribute { key: "sender", value: "5ae5529ca2ab0ca6119bfed72e05f9f5cb12074c8480e1fa0f91126d7cde9838" }, ModuleEventAttribute { key: "receiver", value: "cosmos15acc7q0zx2t3jzwctql9k9mncy2xq5vcksf058" }, ModuleEventAttribute { key: "denom", value: "transfer/channel-232/samoleans" }, ModuleEventAttribute { key: "amount", value: "2933" }, ModuleEventAttribute { key: "memo", value: "" }, ModuleEventAttribute { key: "acknowledgement", value: "AQ==" }] }), height: Height { revision: 0, height: 141265163 } }, IbcEventWithHeight { event: AppModule(ModuleEvent { kind: "fungible_token_packet", module_name: ModuleId("transfer"), attributes: [ModuleEventAttribute { key: "success", value: "AQ==" }] }), height: Height { revision: 0, height: 141265163 } }] }
2023-10-11T08:55:16.278700Z ERROR event_monitor{chain=near-0}: ibc_relayer::event::near_event_monitor: failed to send event batch: sending on a disconnected channel

Version

Steps to Reproduce

RUST_BACKTRACE=full cargo test -p ibc-integration-test -- test_ibc_transfers

Acceptance Criteria

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