Fix work item hierarchy confidentiality error message
What does this MR do and why?
Adding confidentiality error message to base errors
on the issue and work item model as the message is not easy to
express in terms of the confidential
field. Before, rendering
errors.full_messages would read
`confidential confidential parent can not be used if there are non-confidential children.
Reported by @gweaver in https://gitlab.slack.com/archives/C02403NRD40/p1660572030576859 (internal only)
New message
MR acceptance checklist
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Edited by Mario Celi