remove substrate compat #5425

Job	Run time
Check unused dependencies	36s
Cargo fmt	15s
Cargo clippy	3m 30s
Cargo check	5m 36s
Cargo check (WASM)	1m 26s
Check documentation and run doc tests	4m 37s
Cargo clippy (WASM)	1m 0s
Test (no_std)	1m 55s
Test (Light Client)	1m 25s
Test chainhead backend	1m 23s
Test (Native)	1m 19s
Test (WASM)	1m 38s
	24m 40s

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