[quant][pt2e] Fix propagate_annotation after recent refactors (#102422)
Summary:
Recently we changed the annotation from "target_dtype_info" to "quantization_annotation" and introduced QuantizationAnnotation API
and SharedQuantizationSpec API for users to convey sharing between input/outputs, this PR updates the _propagate_annotation
pass to accommadate the recent changes
Test Plan:
```
buck2 test mode/opt caffe2/test:quantization_pt2e -- 'caffe2/test:quantization_pt2e'
```
Reviewed By: kimishpatel
Differential Revision: D46153084
Pull Request resolved: https://github.com/pytorch/pytorch/pull/102422
Approved by: https://github.com/kimishpatel
