[1/N] DP-refactor: move dp balance code into scheduler's mixin class … #2

Job	Run time
bench-test-2-gpu-amd	0s
performance-test-1-gpu-part-2-amd	0s
unit-test-backend-2-gpu-amd	0s
unit-test-sgl-kernel-amd	0s
unit-test-backend-1-gpu-amd	0s
unit-test-backend-8-gpu-CAR-amd	0s
accuracy-test-1-gpu-amd	0s
mla-test-1-gpu-amd	0s
performance-test-1-gpu-part-1-amd	0s
unit-test-backend-8-gpu-amd	0s
accuracy-test-2-gpu-amd	0s
pr-test-amd-finish	3s
	3s

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