Deprecate deleting iterations via the GraphQL API
What does this MR do and why?
Deprecates manual iteration deletion as only automatic iteration cadences will be allowed in the future
How to set up and validate locally
IterationDelete mutation should show a deprecation message in GraphiQL at http://localhost:3000/-/graphql-explorer
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 #356069 (closed)