Force Sam to perform a file search, if a user uploads a file

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.77%. Comparing base (512628b) to head (a1034ff).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #50 +/- ## ========================================== + Coverage 82.97% 85.77% +2.80% ========================================== Files 11 11 Lines 505 506 +1 ========================================== + Hits 419 434 +15 + Misses 86 72 -14 ```

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[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ BadRequestError: Error code: 400 - {'error': {'message': "Invalid type for 'tools[0]': expected an object, but got... sam.bot in execute_run View Issue
• ‼️ BadRequestError: Error code: 400 - {'error': {'message': 'Files with extensions [.png] are not supported for retri... sam.bot in add_message View Issue
• ‼️ RuntimeError: coroutine ignored GeneratorExit sam.slack in handle_message View Issue
• ‼️ BadRequestError: Error code: 400 - {'error': {'message': 'Invalid file format. Supported formats: "c", "cpp", "css... sam.bot in add_message View Issue
• ‼️ ConnectionError: Connection closed by server. sam.slack in send_response View Issue

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