Check slashability of attestations in batches to avoid sequential bottleneck #24945

Job	Run time
target-branch-check	3s
Check for 'skip-ci' label	3s
check-msrv	5m 2s
check-code	12m 18s
lockbud	54s
op-pool-tests	6m 53s
execution-engine-integration-ubuntu	7m 56s
basic-simulator-ubuntu	13m 9s
http-api-tests	19m 52s
beacon-chain-tests	12m 42s
state-transition-vectors-ubuntu	2m 38s
slasher-tests	1m 18s
debug-tests-ubuntu	4m 6s
network-tests	10m 24s
release-tests-ubuntu	15m 36s
fallback-simulator-ubuntu	10m 50s
cargo-udeps	7m 27s
ef-tests-ubuntu	6m 57s
compile-with-beta-compiler	13m 53s
cargo-sort	20s
cli-check	9m 3s
test-suite-success	-1s
	2h 41m 23s

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