Add voluntary exit via validator manager #19314

Job	Run time
check-code	6m 32s
lockbud	14m 0s
Check for 'skip-ci' label	1s
target-branch-check	1s
check-msrv	5m 28s
op-pool-tests	22m 21s
release-tests-ubuntu	10m 7s
debug-tests-ubuntu	6m 39s
beacon-chain-tests	20m 53s
release-tests-windows	15m 30s
network-tests	25m 3s
slasher-tests	3m 35s
state-transition-vectors-ubuntu	8m 59s
basic-simulator-ubuntu	20m 38s
cargo-udeps	7m 14s
cli-check	14m 14s
compile-with-beta-compiler	14m 45s
ef-tests-ubuntu	11m 29s
execution-engine-integration-ubuntu	23s
fallback-simulator-ubuntu	18m 51s
test-suite-success	0s
	3h 46m 43s

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