fix(docs): generate new reference pipeline output before embeddings (#46611)

The embeddings workflow started failing after #46163 with `ENOENT: ...
content/reference/javascript/v2/sections.json`. That PR routed the JS v2
search ingest through the new reference pipeline
(`loadClientLibReferenceFromNewPipeline` in
`apps/docs/scripts/search/sources/reference-doc.ts`), and updated
`predev` and `prebuild` to run both `codegen:references` and
`codegen:references:new`, but missed `preembeddings`. This chains
`codegen:references:new` into `preembeddings` so `pnpm run embeddings`
(and the `:nimbus` / `:refresh` variants that fan out to it) produces
the new pipeline output before the search ingest reads it.

apps/docs/package.json

@@ -31,7 +31,7 @@
     "postbuild": "pnpm run build:sitemap && pnpm run build:llms && ./../../scripts/upload-static-assets.sh",
     "prebuild": "pnpm run codegen:graphql && pnpm run codegen:references && pnpm run codegen:references:new && pnpm run codegen:examples && pnpm run build:guides-markdown && pnpm run build:gz-archive",
     "predev": "pnpm run codegen:graphql && pnpm run codegen:references && pnpm run codegen:references:new && pnpm run codegen:examples",
-    "preembeddings": "pnpm run codegen:references",
+    "preembeddings": "pnpm run codegen:references && pnpm run codegen:references:new",
     "preinstall": "npx only-allow pnpm",
     "presync": "pnpm run codegen:graphql",
     "pretest": "pnpm run codegen:examples",