Document abstraction levels and code reuse
What does this MR do?
This adds documentation describing various abstraction levels, and which you can reuse where.
This is based on the discussion in #49653 (closed) and the example merge request found at !20908 (merged).
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Documentation created/updated -
Conforms to the code review guidelines -
Conforms to the style guides
Edited by Robert Speicher