Refactor feature testing for spec tests #19490

Job	Run time
lockbud	14m 15s
Check for 'skip-ci' label	1s
check-msrv	5m 12s
check-code	14m 1s
target-branch-check	1s
release-tests-ubuntu	28m 33s
network-tests	20m 3s
beacon-chain-tests	28m 47s
release-tests-windows	37m 43s
op-pool-tests	16m 42s
basic-simulator-ubuntu	16m 26s
ef-tests-ubuntu	15m 7s
debug-tests-ubuntu	14m 47s
fallback-simulator-ubuntu	14m 24s
slasher-tests	4m 2s
state-transition-vectors-ubuntu	3m 32s
cargo-sort	35s
cargo-udeps	7m 39s
cli-check	7m 58s
compile-with-beta-compiler	14m 29s
execution-engine-integration-ubuntu	9m 26s
test-suite-success	4s
	4h 33m 47s

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