Drop beacon_chain pubkey to index map cache #169

Job	Run time
check-code	3m 45s
cargo-udeps	6m 45s
beacon-chain-tests	2m 58s
check-msrv	4m 19s
cli-check	9m 10s
compile-with-beta-compiler	13m 33s
debug-tests-ubuntu	19m 53s
dockerfile-ubuntu	13m 20s
ef-tests-ubuntu	25m 45s
doppelganger-protection-test	14m 50s
eth1-simulator-ubuntu	21m 19s
execution-engine-integration-ubuntu	14m 58s
merge-transition-ubuntu	20m 15s
no-eth1-simulator-ubuntu	18m 44s
network-tests	8m 46s
op-pool-tests	4m 11s
release-tests-ubuntu	25m 20s
release-tests-windows	41m 38s
slasher-tests	1m 49s
state-transition-vectors-ubuntu	2m 49s
syncing-simulator-ubuntu	12m 37s
target-branch-check	1s
test-suite-success	0s
	4h 46m 45s

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