Investigate possible another workaround for hardhat-gas-reporter bug

[nkuba]

Refs #2955

In #2970 we introduced a workaround for a bug cgewecke/hardhat-gas-reporter#86.

It turned out that such a workaround is not necessary in tbtc-v2 repository. The difference is that in tbtc-v2 we dont use --deploy-fixture flag for hardhat and we load a global fixture await deployments.fixture() instead of e.g. await deployments.fixture("WalletRegistry).

This may be a solution we can use in all projects that have problems with the gas reporter.

[pdyraga]

@nkuba Can we close this issue now?

[nkuba]

Closed by #2980