Add comprehensive BinOp test coverage for all type combinations

Removed TestUint32ToFloatToInt32 as it tested implementation-defined
behavior that varies across platforms.

Added extensive BinOp test coverage including:
- All 4 combinations: typed OP typed, typed OP untyped, untyped OP typed, untyped OP untyped
- All integer types: int8, int16, int32, int64, uint8, uint16, uint32, uint64
- All float types: float32, float64
- All operators: +, -, *, /, %, &, |, ^, &^, <<, >>

Each operator category has dedicated tests covering all type combinations
to ensure proper handling of integer conversions and type coercion.

Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: cpunion <[email protected]>

Author: xgopilot