improve support for grouped workers in `SpecCluster`#9121

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alisterburt wants to merge 6 commits intodask:mainfrom

alisterburt:speccluster-fix2

Commits on Oct 7, 2025

Add clear terminology, type hints, and failing tests for spec name consistency
alisterburt
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fix test_run_spec_cluster_custom_spec_names to also use string names as now expected
alisterburt
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Add helper methods for spec name ↔ worker name conversion and associated tests to enable grouped worker support in SpecCluster
alisterburt
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Updated core SpecCluster methods to support grouped workers:
alisterburt
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Fix SpecCluster grouped worker scaling semantics to be conservative
alisterburt
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Fix grouped worker spec removal in SpecCluster
alisterburt
committed