Update custom executor docs with `step_*`
requested to merge docs/26481-follow-up-from-fix-missing-build_script-step-for-custom-executor into master
What does this MR do?
Update custom executor docs with step_*
Why was this MR needed?
The steps that are introduced in !1963 (merged) aren't documented in the custom executor API, so users aren't aware of this feature.
What are the relevant issue numbers?
closes #26481 (closed)