Bring the parachain syncing code to the same paradigm as the other services #4132

Job	Run time
cargo-deny (bans licenses sources)	28s
check-no-std	1m 34s
check-features	3m 3s
cargo-spellcheck	22s
check-rustdoc-links	51s
clippy	41s
fmt	33s
fuzzing-binaries-compile	4m 56s
test-32bits	6m 10s
test-64bits	6m 30s
wasm-node-check	2m 0s
wasm-node-versions-match	29s
all-ci	1s
	27m 38s

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