test(e2e): verify ICS20 packet lifecycle

[gjermundgaraba]

Summary

• Adds ICS20 packet-lifecycle assertions for source commitment creation and clearing, destination receipt creation, acknowledgement writing, and acknowledgement execution.
• Uses ibc-go v11 as the source of truth for packet keys, the ICS20 port ID, and voucher-denom construction instead of local constants and string assembly.
• Records the source block on test packets so commitments can be checked at send time, forwards transfer memos, and tightens terminal relayer-status validation.

Testing

• make check
• make test-e2e E2E_MODE=complete

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Closes FOU-1092

[linear-code]

FOU-1092

[greptile-apps]

Greptile Summary

The PR extends the ICS20 end-to-end tests to verify packet commitments, receipts, and acknowledgement events across the complete transfer lifecycle.

• Records each packet's source block so commitment creation can be queried at send time.
• Uses ibc-go v11 helpers for ICS20 ports, voucher denoms, and packet storage keys.
• Forwards transfer memos and validates successful receive and acknowledgement transactions.
• Tightens timed-out relayer-state validation and adds focused unit coverage.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code failure or reachable security issue identified.

The new lifecycle assertions follow the router commitment-key and transaction-event patterns found in the repository, and the investigated relayer and dependency concerns did not establish an actionable failure on a reachable path.

Important Files Changed

Filename	Overview
e2e/internal/e2etest/traffic_transfer.go	Adds memo forwarding and packet-lifecycle verification using ibc-go keys, historical commitment queries, and router event parsing.
e2e/internal/e2etest/traffic_relayer.go	Rejects timed-out terminal statuses that also report receive or acknowledgement transactions.
e2e/transfer_test.go	Extends automatic-relay and timeout tests with commitment, receipt, and acknowledgement lifecycle assertions.
e2e/go.mod	Adds ibc-go v11 as the source of ICS20 constants and key helpers, together with its transitive module graph.

Sequence Diagram

sequenceDiagram
    participant Test
    participant Source as Source EVM
    participant Relayer
    participant Destination as Destination EVM
    Test->>Source: Submit ICS20 transfer
    Source-->>Test: Send receipt and source block
    Test->>Source: Verify packet commitment at send block
    Relayer->>Destination: Receive packet
    Destination-->>Relayer: WriteAcknowledgement
    Test->>Destination: Verify receipt and acknowledgement event
    Relayer->>Source: Execute acknowledgement
    Test->>Source: Verify AckPacket and cleared commitment

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The merge-base changed after approval.