feat(ai-gateway): Migrate AI RAG injector

[tomek-labuk]

Description

Fixes #issue

Preview Links

Updates

• This section: RAG injector plugin can use Admin API for ingesting chunks, but only for on-prem customers. For konnect, we can ingest chunks like here
• Need to confirm the script won't be deprecated

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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[CLAassistant]

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