Use epoch cache in block packing #15283

Job	Run time
beacon-chain-tests	18m 50s
op-pool-tests	15m 47s
network-tests	17m 9s
release-tests-ubuntu	24m 2s
release-tests-windows	31m 31s
cargo-udeps	2m 0s
check-code	4m 52s
check-msrv	4m 58s
target-branch-check	1s
debug-tests-ubuntu	7m 57s
dockerfile-ubuntu	14m 22s
doppelganger-protection-test	19m 32s
ef-tests-ubuntu	16m 27s
eth1-simulator-ubuntu	28m 0s
execution-engine-integration-ubuntu	17m 30s
merge-transition-ubuntu	27m 30s
no-eth1-simulator-ubuntu	28m 6s
slasher-tests	5m 29s
state-transition-vectors-ubuntu	11m 25s
syncing-simulator-ubuntu	22m 17s
cli-check	18m 24s
compile-with-beta-compiler	9m 5s
test-suite-success	0s
	5h 45m 14s

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