Vector DB destinations: Add omit_raw_text flag and increase code reuse

[flash1293]

This PR makes the changes from #32698 available in all vector db destinations.

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Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 1, 2023 9:30am

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[aaronsteers]

Looks great! 🚀