Add voluntary exit via validator manager #19383

Job	Run time
Check for 'skip-ci' label	1s
target-branch-check	1s
check-code	6m 57s
lockbud	14m 58s
check-msrv	5m 11s
beacon-chain-tests	22m 3s
release-tests-windows	12m 52s
network-tests	20m 11s
debug-tests-ubuntu	9m 57s
op-pool-tests	17m 16s
release-tests-ubuntu	7m 51s
slasher-tests	3m 33s
basic-simulator-ubuntu	16m 41s
cargo-udeps	7m 23s
ef-tests-ubuntu	11m 11s
execution-engine-integration-ubuntu	17s
fallback-simulator-ubuntu	14m 47s
state-transition-vectors-ubuntu	3m 52s
cli-check	8m 31s
compile-with-beta-compiler	14m 54s
test-suite-success	0s
	3h 18m 27s

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