[quant] Move graph mode quantization tests to test_quantize_script.py (#36324)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/36324
Test Plan:
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Imported from OSS
Differential Revision: D20948046
fbshipit-source-id: 2dd8f0c6fbe8fd84293420b97592dc586d25def9
