[quant][pt2e][be] Move xnnpack quantizer tests to separate file (#111004)
Summary:
att
Test Plan:
python test/test_quantization.py TestXNNPACKQuantizer
python test/test_quantization.py TestXNNPACKQuantizerModels
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/111004
Approved by: https://github.com/andrewor14