Fix composite tree test: remove referenceId from nested child records

[Copilot]

The test_bridge_composite_tree_operation integration test was failing with INVALID_FIELD - No such column 'referenceId' on sobject of type Contact. Salesforce's Composite Tree API only accepts referenceId on parent records, not nested children.

Changes

• tests/wasm-test-plugin/src/lib.rs: Removed referenceId field from nested Contact record in test_composite_tree function

The corrected structure:

let tree_req = CompositeTreeRequest {
    sobject: "Account".to_string(),
    records: vec![json!({
        "attributes": {"type": "Account"},
        "referenceId": "account1",  // ✓ Parent record only
        "Name": account_name,
        "Contacts": {
            "records": [{
                "attributes": {"type": "Contact"},
                // referenceId removed - not supported for children
                "LastName": contact_last_name
            }]
        }
    })],
};

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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