[Quant][PT2.0] fix issues for rearranging weight observer for decomposed linear (#94296)
**Summary**
Linear is decomposed to `t - addmm/mm` after `dynamo.export`. And weight's observer is inserted between `t` and `addmm/mm` in the first place. `_rearrange_weight_observer_for_addmm()` is then called to move the observer between weight and `t`.
```
before:
weight - t - observer \
input - observer - addmm/mm
after:
weight - observer - t \
input - observer - addmm/mm
```
We found two issues of `_rearrange_weight_observer_for_addmm()`:
- It does not call `m.recompile()` in the end, so it does not function correctly.
- It does not support `aten.mm.default` which is from decomposed linear without bias.
This PR fixes the two issues and renames the function to `_rearrange_weight_observer_for_decomposed_linear`.
**Test plan**
python test/test_quantization.py -k test_rearrange_weight_observer_for_decomposed_linear
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94296
Approved by: https://github.com/jgong5, https://github.com/andrewor14
