[DOC] Deploy `cuvs-java` Javadocs with cuVS documentation

[cjnolet]

Currently we deploy cuVS docs to docs.rapids.ai, but these docs don't yet include the Javadocs that are built w/ the cuvs-java APIs. We should begin deploying these docs nightly.

Here's where the docs are being built:

https://github.com/rapidsai/cuvs/actions/runs/19673532833/job/56351805803?pr=1591#step:12:9404
https://github.com/rapidsai/cuvs/actions/runs/19673532833/job/56351805803?pr=1591#step:12:11590

[cjnolet]

cc @rockhowse @AyodeAwe @KyleFromNVIDIA for awareness. I can create an ops issue for this if needed (would love to have this out for 25.12, but we could prioritize for 26.02 instead of needed).