Add OCR functionality to GDrive connectors

[markbotterill]

Entails modification in cross_connector_utils/file_utils.py so should be reasonably simple to roll out to other connectors.

read_pdf_file function gets additional use_ocr keyword, as shown:

def read_pdf_file(file: IO[Any],
                  file_name: str,
                  pdf_pass: str | None = None,
                  use_ocr: bool = False) -> str:

N.B Docker file for backend currently has "Cleanup" step commented out (likely leading to slightly larger image). Should function as is, but needs investigation into what specific part of the cleanup is causing tesseract to break.

[vercel]

@markbotterill is attempting to deploy a commit to the Danswer Team on Vercel.

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