[MLIR][XeGPU] Add two 8bit float types F8E4M3FN and F8E5M2 to valid XeGPU float type. (#169420) These float types are already part of MLIR built in types. This PR just adds them as valid float types for XeGPU dialect. For bit format of the two float types, see https://onnx.ai/onnx/technical/float8.html
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