Add deprecation for geo nodes API

What does this MR do and why?

Add a deprecation notice about removing geo_nodes API support starting from %17.0 because geo_nodes will be renamed to geo_sites

Screenshots or screen recordings

How to set up and validate locally

• Run bin/rake gitlab:docs:compile_deprecations to compile a deprecation document

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #369140