Implement Gloas withdrawals and refactor #24976

Job	Run time
Check for 'skip-ci' label	3s
check-code	3m 18s
target-branch-check	4s
check-msrv	5m 17s
lockbud	42s
http-api-tests	6m 28s
state-transition-vectors-ubuntu	7m 5s
network-tests	15m 50s
debug-tests-ubuntu	5m 27s
release-tests-ubuntu	16m 18s
slasher-tests	3m 7s
fallback-simulator-ubuntu	17m 54s
beacon-chain-tests	3m 49s
op-pool-tests	11m 10s
execution-engine-integration-ubuntu	8m 0s
cargo-sort	14s
cli-check	13m 29s
cargo-udeps	7m 21s
basic-simulator-ubuntu	20m 5s
ef-tests-ubuntu	3m 57s
compile-with-beta-compiler	13m 18s
test-suite-success	0s
	2h 42m 56s

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