Use cached issue metdata for Epic
What does this MR do and why?
- Instead of loading whole descendant hierarchy for an epic, we use cached issue counts/weights
- for has_children? is used batchloader to get only all direct children for an epic
Related to #356686
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How to set up and validate locally
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MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Jan Provaznik