AzureAISearchTool hides real documents metadata

- **Package Name**: azure-ai-agents
- **Package Version**: current
- **Operating System**: any
- **Python Version**: current

**Describe the bug**
`tool_result` returns some remapped document titles in the format `doc_N` hiding from the user the actual document used to generate an agent answer.

**To Reproduce**
Steps to reproduce the behavior:
1. add a search tool to an agent as done [here](https://learn.microsoft.com/en-us/azure/ai-foundry/agents/how-to/tools/azure-ai-search-samples?pivots=python)
2. ask questions to agent requiring usage of search
3. Get this returned
```
...
"response": [
{
"createdAt": "2025-06-17T13:11:39Z",
"run_id": "run_V982yFlekmxdGVIvZnjoUzr8",
"tool_call_id": "call_ElLHknEhOr7sIPS8mVnD2TBj",
"role": "tool",
"content": [
{
"type": "tool_result",
"tool_result": "{'summary': 'Retrieved 5 documents.', 'metadata': {'urls': ['doc_0', 'doc_1', 'doc_2', 'doc_3', 'doc_4'], 'titles': ['doc_0', 'doc_1', 'doc_2', 'doc_3', 'doc_4'], 'get_urls': ['xxx', ...], 'ids': ['OTM4MjU3OA2', 'OTM4MjMyNw2', 'OTM4NTMyNg2', 'OTM4Mzk5MA2', 'OTM4MzE5Mw2'], 'command': 'search', 'query_type': 'simple', 'top_k': 5, 'filter': True}}"
}
]
},
...
```

**Expected behavior**
I expect to get the actual titles and possibly other metadata present in the search index. The current behavior does not provide an easy way for the user to verify the information from the source documents.

**Screenshots**
N/A

**Additional context**
N/A