Delete planning hierarchy code and docs
What does this MR do and why?
Delete planning hierarchy code and docs (https://gitlab.slack.com/archives/C72HPNV97/p1724341306435209)
Delete the following as planning hierarchy is no longer part of the product
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
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How to set up and validate locally
Edited by Coung Ngo