Refactor feature testing for spec tests #19489

Job	Run time
Check for 'skip-ci' label	1s
check-msrv	37s
check-code	26s
lockbud	26s
target-branch-check	1s
op-pool-tests	34s
release-tests-windows	12s
release-tests-ubuntu	15s
debug-tests-ubuntu	27s
network-tests	20s
beacon-chain-tests	27s
slasher-tests	20s
state-transition-vectors-ubuntu	32s
basic-simulator-ubuntu	18s
cargo-udeps	13s
ef-tests-ubuntu	26s
execution-engine-integration-ubuntu	26s
fallback-simulator-ubuntu	15s
cargo-sort	14s
cli-check	34s
compile-with-beta-compiler	19s
test-suite-success	1s
	7m 24s

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