docs: Update Review Apps deployment and e2e tests diagram

What does this MR do and why?

This makes sure our documentation is up-to-date.

Screenshots or screen recordings

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 #364770 (closed)