Add `issuableDatesUpdated` subscription to GraphQL API
What does this MR do and why?
Adds issuableDatesUpdated
subscription to GraphQL for realtime updates
How to set up and validate locally
No easy way to validate locally as currently there's no way to test subscriptions via GraphiQL
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 #365399 (closed)