Fix dependency cycle in GroupBasedPartitioner._can_merge_partitions #2441

Job	Run time
test-vulkan / test-backend-macos	0s
test-vulkan / test-backend-linux (vulkan, operators) / linux-job	16m 43s
test-vulkan / test-backend-linux (vulkan, models) / linux-job	20m 22s
test-vulkan / package-golden-artifacts	3m 30s
	40m 35s

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