[Relax] Clean up scatter_elements unknown dtype handling

[guan404ming]

Why

• LOG(WARNING) is the standard and correct approach throughout the TVM codebase
• The existing pattern is used consistently in all relax ops (see test_op_manipulate.py, index.cc, etc.)
• Added test coverage for previously untested scenarios

[gemini-code-assist[bot]]

Summary of Changes

Hello @guan404ming, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the scatter_elements operator's behavior when encountering unknown data types. It standardizes the warning mechanism to LOG(WARNING) and removes outdated TODO comments, aligning with existing TVM codebase practices. Additionally, it enhances test coverage to ensure proper handling of previously untested scenarios involving unknown data and update tensor data types.

Highlights

• Standardized Warning Mechanism: The handling of unknown data types in the scatter_elements operator now consistently uses LOG(WARNING), aligning with standard practices across the TVM codebase.
• Removed TODO Comments: Outdated TODO comments related to warning reporting for unknown data types in InferStructInfoScatterElements have been removed.
• Enhanced Test Coverage: New test cases have been added for scatter_elements to specifically cover scenarios where the data or updates tensors have unknown data types, ensuring more robust behavior.

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[guan404ming]

cc @tlopex @mshr-h