[Quant][Inductor] add UT of dequant promotion for linear (#106935)
**Summary**
Previously the UT of dequant promotion in Inductor only tests convolution. Now add linear case in the UT. This is for quantization PT2E with Inductor.
**Test plan**
python test/inductor/test_mkldnn_pattern_matcher.py -k test_dequant_promotion
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106935
Approved by: https://github.com/leslie-fang-intel, https://github.com/jgong5, https://github.com/eellison
ghstack dependencies: #105818, #106781, #106782, #106934
