fix: RPC challenge_get/list now shows correct emissionWeight and mech… #469

Job	Run time
Coverage	17s
Build	13s
Clippy	13s
Test	5s
Nightly Build & Test	0s
Docker Nightly Build	0s
Integration	1s
E2E	1s
Docker Integration (5 Validators + WASM)	1s
Docker	1s
Release	1s
	53s

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