Fix gas report generation (#4824)

Co-authored-by: ernestognw <ernestognw@gmail.com>

hardhat/env-contract.js

@@ -1,18 +0,0 @@
-// Remove the default account from the accounts list used in tests, in order
-// to protect tests against accidentally passing due to the contract
-// deployer being used subsequently as function caller
-//
-// This operation affects:
-// - the accounts (and signersAsPromise) parameters of `contract` blocks
-// - the return of hre.ethers.getSigners()
-extendEnvironment(hre => {
-  // TODO: replace with a mocha root hook.
-  // (see https://github.com/sc-forks/solidity-coverage/issues/819#issuecomment-1762963679)
-  if (!process.env.COVERAGE) {
-    // override hre.ethers.getSigner()
-    // note that we don't just discard the first signer, we also cache the value to improve speed.
-    const originalGetSigners = hre.ethers.getSigners;
-    const filteredSignersAsPromise = originalGetSigners().then(signers => signers.slice(1));
-    hre.ethers.getSigners = () => filteredSignersAsPromise;
-  }
-});