Add Vector Database feature table

[yetanothertw]

Summary

Part of https://github.com/elastic/docs-content-internal/issues/1780

Adding a table on the Compare Cloud Hosted and Serverless page to include the new Vector Database project type in the feature comparison.

Preview of the updated page: https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/8273/deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings#elasticsearch-vector-database

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

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🔍 Preview links for changed docs

• deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings.md

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Elastic Docs Style Checker (Vale)

Summary: 1 warning found

⚠️ Warnings (1): Fix when the suggestion improves clarity or correctness.

File	Line	Rule	Message
deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings.md	115	Elastic.Spelling	'vectordb' is a possible misspelling.

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The Vale linter checks documentation changes against the Elastic Docs style guide. To use Vale locally or report issues, refer to Elastic style guide for Vale.

[shainaraskas]

✅ with the caveat that this ultimately needs refactoring for both es and vdb to pull out the primitives + then clarify the relationship of all of the solutions with those primitives

[yetanothertw]

✅ with the caveat that this ultimately needs refactoring for both es and vdb to pull out the primitives + then clarify the relationship of all of the solutions with those primitives

Opened https://github.com/elastic/docs-content-internal/issues/1785 to track this ☝️