Use oldest_block_slot to break off pruning payloads #19603

Job	Run time
Check for 'skip-ci' label	1s
check-msrv	5m 13s
check-code	14m 0s
lockbud	13m 53s
target-branch-check	1s
beacon-chain-tests	24m 47s
op-pool-tests	22m 2s
release-tests-ubuntu	27m 53s
network-tests	24m 16s
release-tests-windows	30m 16s
slasher-tests	3m 42s
debug-tests-ubuntu	8m 1s
basic-simulator-ubuntu	21m 30s
cargo-sort	8s
cargo-udeps	17s
cli-check	14m 50s
compile-with-beta-compiler	15m 12s
execution-engine-integration-ubuntu	14m 0s
ef-tests-ubuntu	11m 19s
fallback-simulator-ubuntu	19m 56s
state-transition-vectors-ubuntu	8m 20s
test-suite-success	0s
	4h 39m 37s

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