Use oldest_block_slot to break off pruning payloads #19638

Job	Run time
check-msrv	5m 25s
check-code	13m 19s
Check for 'skip-ci' label	1s
lockbud	14m 15s
target-branch-check	1s
release-tests-windows	51m 28s
beacon-chain-tests	27m 39s
debug-tests-ubuntu	8m 45s
op-pool-tests	21m 44s
release-tests-ubuntu	29m 12s
network-tests	24m 33s
slasher-tests	3m 53s
state-transition-vectors-ubuntu	8m 11s
basic-simulator-ubuntu	22m 0s
cargo-sort	17s
cargo-udeps	7m 19s
cli-check	14m 55s
compile-with-beta-compiler	16m 30s
ef-tests-ubuntu	12m 35s
execution-engine-integration-ubuntu	14m 8s
fallback-simulator-ubuntu	19m 37s
test-suite-success	3s
	5h 15m 50s

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