In two places parameters passed to the python client when using either
Ingest workflow and `partition_via_api` function directly we parse the
parameters with list values to strings e.g.
```python
extract_image_block_types=["image"] -> extract_image_block_types='["image"]'
```
as of now these parameters are parsed incorrectly when given as strings
and correctly when given as lists.
This PR removes parsing from `PartitionConfig` and `partition_via_api`.
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Co-authored-by: Filip Knefel <filip@unstructured.io>
c2065db716