Update & consolidate custom roles development docs
What does this MR do and why?
- Simplifies the custom roles development docs. We have had updates to the tooling that weren't clear in the docs. So, I have removed some of the outdated steps & added step-wise instructions.
- Also adds specific examples of how GroupPolicy & ProjectPolicy need to be updated.
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Related to #436707 (closed)
Edited by Hinam Mehra