refactor(rpc-backend): Remove mocks from eth/rpc/backend, partially c…

…ompleting #2037 (#2041)

* refactor: partial commit from #2037. Remove mocks

* chore: changelog

CHANGELOG.md

@@ -120,6 +120,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [#2030](https://github.com/NibiruChain/nibiru/pull/2030) - refactor(eth/rpc): Delete unused code and improve logging in the eth and debug namespaces
 - [#2031](https://github.com/NibiruChain/nibiru/pull/2031) - fix(evm): debug calls with custom tracer and tracer options
 - [#2039](https://github.com/NibiruChain/nibiru/pull/2039) - refactor(rpc-backend): remove unnecessary interface code
+- [#2039](https://github.com/NibiruChain/nibiru/pull/2039) - refactor(rpc-backend): Remove mocks from eth/rpc/backend, partially completing [nibiru#2037](https://github.com/NibiruChain/nibiru/issue/2037). 
 
 #### Dapp modules: perp, spot, oracle, etc