Add Capella & Deneb light client support #15492

Job	Run time
release-tests-ubuntu	24m 22s
target-branch-check	1s
beacon-chain-tests	20m 2s
debug-tests-ubuntu	9m 6s
dockerfile-ubuntu	14m 28s
ef-tests-ubuntu	16m 45s
network-tests	17m 52s
op-pool-tests	20m 15s
release-tests-windows	27m 26s
slasher-tests	5m 27s
state-transition-vectors-ubuntu	11m 24s
cargo-udeps	6m 49s
check-code	9m 57s
check-msrv	4m 21s
cli-check	17m 28s
compile-with-beta-compiler	13m 23s
doppelganger-protection-test	22m 55s
eth1-simulator-ubuntu	29m 33s
execution-engine-integration-ubuntu	5m 40s
merge-transition-ubuntu	29m 52s
no-eth1-simulator-ubuntu	27m 56s
syncing-simulator-ubuntu	21m 44s
test-suite-success	0s
	5h 56m 46s

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