Fix tool_call_accuracy evaluator sample format causing "Tool definition not found" error

[Copilot]

The sample code for ToolCallAccuracyEvaluator in evaluation_samples_evaluate.py was using incorrect parameter formats that caused a "Tool definition not found" error when users tried to run it.

Issue

The sample had two format problems:

1. tool_calls format: Used nested dict structure instead of the expected flat list format
2. tool_definitions format: Used single dict instead of list, and missing required "type" field

Before (broken sample):

tool_calls={
    "type": "tool_call",
    "tool_call": {
        "id": "call_eYtq7fMyHxDWIgeG2s26h0lJ",
        "type": "function",
        "function": {
            "name": "fetch_weather",
            "arguments": {"location": "New York"}
        }
    }
},
tool_definitions={
    "id": "fetch_weather",
    "name": "fetch_weather",
    "description": "Fetches the weather information for the specified location.",
    "parameters": {...}
}

After (working sample):

tool_calls=[
    {
        "type": "tool_call",
        "tool_call_id": "call_eYtq7fMyHxDWIgeG2s26h0lJ", 
        "name": "fetch_weather",
        "arguments": {"location": "New York"}
    }
],
tool_definitions=[
    {
        "name": "fetch_weather",
        "type": "function",
        "description": "Fetches the weather information for the specified location.",
        "parameters": {...}
    }
]

Validation

• ✅ Fixed sample now parses correctly without errors
• ✅ Existing unit test format continues to work (no regressions)
• ✅ Original problematic format still fails as expected (good validation)

The sample now matches the format expected by the evaluator implementation and demonstrated in the unit tests.

Fixes #41543.

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