Display mutation errors on iteration cadence form
What does this MR do and why?
Related to !82352 (merged), splitting into separate MR to keep that one simpler
Displays mutation errors when creating or updating an iteration cadence
How to set up and validate locally
Not easy to make the mutation fail as there are many frontend validations in place. But after !82352 (merged) is merged (or using that commit), you can see the error message if you try to create a manual iteration cadence or convert an existing one into manual.
iteration_cadences
FF needs to be enabled.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #353350 (closed)