Add exception to float->int conversion test case

[ppapierk]

Downcasting float32 values beyond target type value range is an undefined behaviour according to torch documentation.

[Copilot]

Pull Request Overview

Adds an exception to handle undefined behavior in float-to-integer conversion test cases for XPU devices. The PR addresses cases where downcasting float32 values beyond the target integer type's value range leads to undefined behavior.

• Extended the conditional check to include XPU alongside HIP for handling divergent float-to-int conversion
• Added explanatory comments for XPU's divergent behavior with int8 and int16 conversions
• Applied minor code formatting improvements to the dtypesIfCUDA decorator

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