test-runtime: json_patch dep removed (#3062)

We don't need dependency on `json_patch` there is implementation of
needed function in `sc_chain_spec` crate.
This PR makes this function publicly available and removes the dep.

Cargo.lock

@@ -6756,17 +6756,6 @@ version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "078e285eafdfb6c4b434e0d31e8cfcb5115b651496faca5749b88fafd4f23bfd"
 
-[[package]]
-name = "json-patch"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f54898088ccb91df1b492cc80029a6fdf1c48ca0db7c6822a8babad69c94658"
-dependencies = [
- "serde",
- "serde_json",
- "thiserror",
-]
-
 [[package]]
 name = "jsonrpsee"
 version = "0.20.3"
@@ -19518,13 +19507,13 @@ dependencies = [
  "frame-system",
  "frame-system-rpc-runtime-api",
  "futures",
- "json-patch",
  "log",
  "pallet-babe",
  "pallet-balances",
  "pallet-timestamp",
  "parity-scale-codec",
  "sc-block-builder",
+ "sc-chain-spec",
  "sc-executor",
  "sc-executor-common",
  "sc-service",