Modularize beacon processor scheduler #18951

Job	Run time
Check for 'skip-ci' label	1s
target-branch-check	1s
check-msrv	5m 13s
check-code	9m 43s
lockbud	13m 35s
beacon-chain-tests	38m 29s
release-tests-ubuntu	22m 19s
op-pool-tests	15m 35s
release-tests-windows	43m 50s
basic-simulator-ubuntu	13m 17s
debug-tests-ubuntu	9m 48s
ef-tests-ubuntu	5m 55s
fallback-simulator-ubuntu	10m 59s
network-tests	18m 32s
slasher-tests	1m 48s
state-transition-vectors-ubuntu	2m 19s
cargo-udeps	7m 32s
cli-check	6m 17s
compile-with-beta-compiler	13m 41s
execution-engine-integration-ubuntu	13m 45s
test-suite-success	6s
	4h 12m 45s

Provide feedback