[Core][Minor] Remove unreachable code path for ray_namespace. #25305
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Why are these changes needed?
The job level ray_namespace will be set to task spec when creating an actor without an explicitly specifying namespace for actor. Therefore, in the gcs actor manager, the ray_namespace in task spec shouldn't be empty.
This PR remove the unreachable code path which is using to get the namespace from a local cache.
Related issue number
Checks
scripts/format.sh
to lint the changes in this PR.