Rust

Migrate custom error trait impls to `thiserror` #5470

Job	Run time
Check unused dependencies	52s
Cargo fmt	21s
Cargo check	2m 15s
Cargo check (WASM)	1m 29s
Check documentation and run doc tests	1m 22s
Cargo clippy	1m 58s
Cargo clippy (WASM)	1m 46s
Test (no_std)	1s
Test (Native)	1s
Test chainhead backend	1s
Test (Light Client)	1s
Test (WASM)	1s
	10m 8s

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