Fix node test reporter not stripping some diffs because of coloring

[antico5]

The code inside error-formating#formatSingleError is removing the diff text generated by the node:test error, so we can append the one generated by us (using jest-diff).

It was failing to find some of the diffs when color was enabled on the terminal (e.g. on my system, the tests for the reporter don't pass on v-next branch).

This PR disables color via env. variable , and restores it just after running the tests. This env. var doesn't affect our own diff coloring (for which we use jest-diff).

Also I set the env. var on the integration tests suite, so tests now pass on my system besides just the CI

Closes #6688

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 72de64e54b65206b7c74520d8eea3587e13adc3e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 20 packages

Name	Type
@nomicfoundation/hardhat-node-test-reporter	Patch
@nomicfoundation/hardhat-node-test-runner	Patch
hardhat	Patch
@nomicfoundation/hardhat-errors	Patch
@nomicfoundation/hardhat-ethers-chai-matchers	Patch
@nomicfoundation/hardhat-ignition	Patch
@nomicfoundation/ignition-core	Patch
@nomicfoundation/hardhat-ignition-ethers	Patch
@nomicfoundation/ignition-ui	Patch
@nomicfoundation/hardhat-ignition-viem	Patch
@nomicfoundation/hardhat-keystore	Patch
@nomicfoundation/hardhat-mocha	Patch
@nomicfoundation/hardhat-network-helpers	Patch
@nomicfoundation/hardhat-test-utils	Patch
@nomicfoundation/hardhat-typechain	Patch
@nomicfoundation/hardhat-utils	Patch
@nomicfoundation/hardhat-toolbox-mocha-ethers	Patch
@nomicfoundation/hardhat-viem	Patch
@nomicfoundation/hardhat-viem-matchers	Patch
@nomicfoundation/hardhat-zod-utils	Patch

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[alcuadrado]

Oh, i never realized that this was because of the colors!

I wonder if we can make something similar, but in the reporter, no the test run. So that the reporter logic is self-contained.

[galargh]

@antico5 I did a little exploration on forcing the colors for the tests and trying to disable them from within the reporter - https://github.com/NomicFoundation/hardhat/pull/6769

[galargh]

Nice! Let's just add process.env.FORCE_COLOR = 1 before https://github.com/NomicFoundation/hardhat/blob/v-next/v-next/hardhat-node-test-reporter/integration-tests/index.ts#L85. That way we'll see whether the colors are correctlys tripped in CI.