Enable progressive balances fast mode by default #14690

Job	Run time
op-pool-tests	11m 0s
network-tests	7m 59s
release-tests-ubuntu	25m 16s
beacon-chain-tests	19m 14s
release-tests-windows	26m 8s
target-branch-check	1s
cargo-udeps	5m 57s
check-code	8m 7s
check-msrv	6m 19s
compile-with-beta-compiler	12m 55s
debug-tests-ubuntu	8m 48s
dockerfile-ubuntu	15m 57s
doppelganger-protection-test	20m 17s
ef-tests-ubuntu	14m 58s
eth1-simulator-ubuntu	17m 54s
execution-engine-integration-ubuntu	17m 27s
merge-transition-ubuntu	18m 39s
no-eth1-simulator-ubuntu	18m 50s
slasher-tests	1m 24s
state-transition-vectors-ubuntu	2m 35s
syncing-simulator-ubuntu	12m 9s
	4h 31m 54s

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