Fix composite tree record structure in WASM test plugin

[Copilot]

The test_bridge_composite_tree_operation integration test was failing with INVALID_REQUEST: invalid tree records: missing field 'referenceId' from Salesforce.

Root Cause

The WASM test plugin constructed composite tree records with referenceId nested inside the attributes object:

{
  "attributes": {
    "type": "Account",
    "referenceId": "account1"  // ❌ Wrong location
  },
  "Name": "Test Account"
}

Salesforce's Composite Tree API requires referenceId at the record's top level, not nested in attributes:

{
  "attributes": {
    "type": "Account"
  },
  "referenceId": "account1",  // ✅ Correct location
  "Name": "Test Account"
}

Changes

• tests/wasm-test-plugin/src/lib.rs: Moved referenceId from attributes to top level for both Account and Contact records in test_composite_tree function

This structure matches the format documented in sf-wasm-types test examples and the CompositeTreeRecord type definition in sf-rest.

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[Copilot]

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