Fix one and hide all beacon-processor flags #15607

Job	Run time
beacon-chain-tests	18m 20s
release-tests-ubuntu	22m 29s
release-tests-windows	27m 14s
target-branch-check	1s
debug-tests-ubuntu	11m 0s
ef-tests-ubuntu	11m 46s
dockerfile-ubuntu	13m 25s
eth1-simulator-ubuntu	19m 47s
op-pool-tests	11m 15s
network-tests	8m 5s
slasher-tests	1m 33s
check-code	7m 49s
state-transition-vectors-ubuntu	2m 37s
doppelganger-protection-test	21m 30s
execution-engine-integration-ubuntu	15m 36s
merge-transition-ubuntu	20m 3s
no-eth1-simulator-ubuntu	18m 0s
syncing-simulator-ubuntu	12m 34s
cargo-udeps	7m 2s
check-msrv	4m 18s
cli-check	8m 24s
compile-with-beta-compiler	13m 54s
test-suite-success	6s
	4h 36m 48s

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