[chore] Add sharded batcher wrapper for unpartitioned batching #36964

Job	Run time
windows-unittest (windows-2022)	17m 12s
windows-service-test (windows-2022)	4m 1s
windows-service-test (windows-2025)	2m 20s
windows-service-test (windows-11-arm)	2m 50s
windows-unittest (windows-11-arm)	12m 23s
windows-unittest (windows-2025)	19m 8s
	57m 54s

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