fix: review feedback

Author: tamtamchik

.solcover.js

@@ -4,14 +4,10 @@ module.exports = {
   //       https://github.com/sc-forks/solidity-coverage/issues/632#issuecomment-1736629543
   skipFiles: [
     "common/interfaces",
-    "common/test_helpers",
     "0.4.24/template",
-    "0.4.24/test_helpers",
     "0.6.11/deposit_contract.sol",
     "0.6.12/interfaces",
-    "0.6.12/mocks",
     "0.8.9/interfaces",
-    "0.8.9/test_helpers",
     // Skip contracts that are tested by Foundry tests
     "common/lib", // 100% covered by test/common/*.t.sol
     "0.8.9/lib/UnstructuredStorage.sol", // 100% covered by test/0.8.9/unstructuredStorage.t.sol