Pass `multi_build_steps` as a Runner Feature when requesting a job
What does this MR do?
Followup of: #6409 (closed)
It sends a new feature multi_build_steps
to rails so that it knows the runner supports it.
Why was this MR needed?
What's the best way to test this MR?
What are the relevant issue numbers?
Closes #26307 (closed)
Edited by Lyubomir Raykov