Handle lack of support for docx/pptx/xlsx for media description

[pamelafox]

Purpose

Fixes #2242

Unfortunately, the figures extraction doesn't yet work for office documents. This PR makes the flow default to standard ingestion for them. We could also have it error out entirely, like it does now, but with a more helpful message. Am not sure what developers would prefer.

Still working on the unit test

Does this introduce a breaking change?

When developers merge from main and run the server, azd up, or azd deploy, will this produce an error?
If you're not sure, try it out on an old environment.

[ ] Yes
[X] No

Does this require changes to learn.microsoft.com docs?

This repository is referenced by this tutorial
which includes deployment, settings and usage instructions. If text or screenshot need to change in the tutorial,
check the box below and notify the tutorial author. A Microsoft employee can do this for you if you're an external contributor.

[ ] Yes
[X] No

Type of change

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

Code quality checklist

See CONTRIBUTING.md for more details.

• The current tests all pass (python -m pytest).
• I added tests that prove my fix is effective or that my feature works
• I ran python -m pytest --cov to verify 100% coverage of added lines
• I ran python -m mypy to check for type errors
• I either used the pre-commit hooks or ran ruff and black manually on my code.

[mattgotteiner]

warning or error?

[pamelafox]

Just tested with error, that looks good. I think error makes sense given that I do really want people to notice it!

[mattgotteiner]

warning looks good!

[mattgotteiner]

Thanks!