Non-Working Days in Burndown Charts

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The current Burndown Chart in Gitlab doesn't consider Non-Working Days (weekends for example).

Add an option for configuring Non-Working Days in a milestone so the charts will be more accurate.

Atlassian's Jira does support this so the burndown is accurate, see example:

Edited Aug 28, 2025 by 🤖 GitLab Bot 🤖