[historyserver] Ensure at least one worker in sample RayCluster #4330
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Why are these changes needed?
We should test the history server with both a head node and at least one worker node; this makes it easier to find bugs.
How I test it?
This directory contains two subdirectories: one for the head node and the other for the worker node.
E2E test passed

Related issue number
#4274
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