Add docs for authenticating with ID tokens

What does this MR do and why?

This MR adds document for the id_tokens and secrets Category:Secrets Management features that were added in #356986 (closed) and #360657 (closed)

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 #384592 (closed)