Remove expire Etag TODO from issues
What does this MR do and why?
We no longer need to expire etag cache for issues that belong directly to a group instead of a project since they will only be displayed in the new work item detail view that uses GraphQL subscriptions instead of polling on the real_time_updates endpoint
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 #395814 (closed)