Trigger issuable_labels_updated only when issuable is updated
What does this MR do and why?
Refactors how we trigger issuable_labels_updated
when labels are updated for an issuable. This way we only trigger issuable_labels_updated
after a successful issuable update.
Also adds a missing spec for work items update service
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #339756 (closed)