fix: merge weights by mechanism_id to avoid nonce conflicts in CRv4 c… #460

Job	Run time
Test	1m 19s
Coverage	1m 35s
Clippy	1m 54s
Build	2m 29s
Nightly Build & Test	0s
Docker Nightly Build	0s
E2E	1m 23s
Docker Integration (5 Validators + WASM)	5m 11s
Integration	1m 22s
Docker	2m 10s
Release	0s
	17m 23s

Provide feedback