Allow issue/work_item to check sla_available? at namespace level
What does this MR do and why?
Before, all issues belonged to a project, so licensed features would always be done at the project level. With this change, licensed feature checks can be done at the namespace level for issues/work_items
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 #422960 (closed)