[BUG]: Doesn't recognize charts in files other than PDF

Version

24.12

Which installation method(s) does this occur on?

Source

Describe the bug.

Ingestion of pdf files extracts charts as structured document_types but it doesn't extract charts from pptx and docx files.

Minimum reproducible example

`
ingestor = (
    Ingestor(message_client_hostname=HTTP_HOST, message_client_port=HTTP_PORT)
    .files('sample-test.pptx')
    .extract(
        extract_text=True,
        extract_tables=True,
        extract_charts=True,
        extract_images=True,
        text_depth="document",
    ).dedup(
        content_type="image",
        filter=True,
    ).store(
        structured=True,
        images=True,
        store_method="minio",
        params={
            "access_key": MINIO_ACCESS_KEY, 
            "secret_key": MINIO_SECRET_KEY,
        }
    )
)
generated_metadata = ingestor.ingest()[0]
`

Relevant log output

`
for i in range(len(generated_metadata)):
    print(generated_metadata[i]['document_type'])
`
image
structured
structured
structured
text

Other/Misc.

No response

Start with the provided Python Ingestor reproduction using the sample PPTX, then compare chart extraction for PDF, PPTX, and DOCX inputs. Confirm that PPTX and DOCX charts are emitted as structured document types alongside the existing PDF behavior.