Delete PRE_CAPELLA_ENGINE_CAPABILITIES #15635

Job	Run time
beacon-chain-tests	17m 54s
cargo-udeps	6m 38s
check-code	9m 56s
check-msrv	4m 17s
cli-check	17m 48s
compile-with-beta-compiler	14m 24s
debug-tests-ubuntu	14m 42s
dockerfile-ubuntu	13m 46s
doppelganger-protection-test	22m 44s
eth1-simulator-ubuntu	29m 48s
ef-tests-ubuntu	11m 1s
execution-engine-integration-ubuntu	17m 42s
merge-transition-ubuntu	29m 23s
network-tests	16m 51s
no-eth1-simulator-ubuntu	28m 46s
op-pool-tests	20m 7s
release-tests-ubuntu	20m 45s
release-tests-windows	25m 3s
slasher-tests	5m 55s
state-transition-vectors-ubuntu	12m 3s
syncing-simulator-ubuntu	23m 17s
target-branch-check	1s
test-suite-success	7s
	6h 2m 58s

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