[reland][quant][pt2e][be] Cleanup observer insertion logic (#111828) #112453
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Summary: att, after SharedQuantizationSpec bug fix we are doing some checks before hand, this can simplify the logic when we insert observers
Test Plan:
contbuild & OSS CI, see https://hud.pytorch.org/commit/pytorch/pytorch/bf998a2c5d549cf4856c7becfca4a169bf68b709
Test plan from GitHub:
python test/test_quantization.py TestQuantizePT2E
CIs
Differential Revision: D50816224
Pulled By: jerryzh168