Add test to beacon node fallback feature #19492

Job	Run time
lockbud	14m 5s
Check for 'skip-ci' label	1s
check-code	13m 30s
check-msrv	5m 16s
target-branch-check	1s
release-tests-ubuntu	24m 34s
beacon-chain-tests	21m 41s
network-tests	18m 25s
op-pool-tests	15m 32s
debug-tests-ubuntu	15m 7s
ef-tests-ubuntu	9m 32s
release-tests-windows	43m 59s
slasher-tests	1m 35s
state-transition-vectors-ubuntu	2m 13s
basic-simulator-ubuntu	13m 40s
cargo-sort	23s
cargo-udeps	7m 22s
cli-check	6m 21s
compile-with-beta-compiler	14m 21s
execution-engine-integration-ubuntu	10m 59s
fallback-simulator-ubuntu	11m 10s
test-suite-success	5s
	4h 9m 52s

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