refactor!: update AzureOCRDocumentConverter to not use the dataframe field for tabular Documents

[sjrl]

Related Issues

• fixes Refactor AzureOCRDocumentConverter to not produce Documents with the dataframe field #8852

Proposed Changes:

Removes saving of table documents as dataframes. Instead saves them as CSV strings.

How did you test it?

Updated tests to reflect that we check for csv formatted tables now.

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 13625493255

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 20 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 89.971%

---

Files with Coverage Reduction	New Missed Lines	%
components/converters/azure.py	20	89.2%

Totals
Change from base Build 13589137191:	-0.01%
Covered Lines:	9563
Relevant Lines:	10629

---

💛 - Coveralls

[anakin87]

Looks good!

nit: we can change the title of this PR to something like "refactor!: make AzureOCRDocumentConverter not use the dataframe field for tabular Documents"