[BugFix] Replay Buffer prefetch & SliceSampler #7408

Job	Run time
tests-cpu (3.10) / linux-job	7m 9s
tests-gpu (3.12, 13.0) / linux-job	11m 15s
tests-cpu (3.11) / linux-job	7m 2s
tests-optdeps (3.12, 13.0) / linux-job	9m 29s
tests-gpu-distributed (3.12, 13.0) / linux-job	10m 45s
test-setup-minimal (3.14) / linux-job	5m 26s
tests-cpu (3.12) / linux-job	7m 18s
test-setup-minimal (3.10) / linux-job	5m 10s
tests-olddeps (3.9, 11.6) / linux-job	10m 13s
tests-stable-gpu-distributed (3.12, 13.0) / linux-job	10m 41s
tests-stable-gpu (3.12, 13.0) / linux-job	11m 10s
tests-cpu (3.13) / linux-job	7m 44s
tests-cpu (3.14) / linux-job	7m 45s
	1h 51m 7s

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