contracts-bedrock: remove unused coverage package

The `solidity-coverage` package is no longer used.
Don't import it into hardhat to speed up hardhat
and lessen the memory footprint.

packages/contracts-bedrock/hardhat.config.ts

@@ -5,7 +5,6 @@ import { TASK_COMPILE_SOLIDITY_GET_SOURCE_PATHS } from 'hardhat/builtin-tasks/ta
 // Hardhat plugins
 import '@nomiclabs/hardhat-ethers'
 import '@typechain/hardhat'
-import 'solidity-coverage'
 import 'hardhat-deploy'
 import '@foundry-rs/hardhat-forge'
 import '@eth-optimism/hardhat-deploy-config'

packages/contracts-bedrock/package.json

@@ -23,7 +23,7 @@
     "gas-snapshot": "forge snapshot",
     "storage-snapshot": "./scripts/storage-snapshot.sh",
     "slither": "slither .",
-    "clean": "rm -rf ./dist ./artifacts ./forge-artifacts ./cache ./coverage ./tsconfig.tsbuildinfo",
+    "clean": "rm -rf ./dist ./artifacts ./forge-artifacts ./cache ./tsconfig.tsbuildinfo",
     "lint:ts:check": "eslint . --max-warnings=0",
     "lint:contracts:check": "yarn solhint -f table 'contracts/**/*.sol'",
     "lint:check": "yarn lint:contracts:check && yarn lint:ts:check",
@@ -62,7 +62,6 @@
     "hardhat-deploy": "^0.11.4",
     "solhint": "^3.3.6",
     "solhint-plugin-prettier": "^0.0.5",
-    "solidity-coverage": "^0.7.16",
     "ts-node": "^10.1.0",
     "typechain": "^5.1.2",
     "typescript": "^4.6.2"