feat: Load hardhat.config.cjs to partially support ESM projects

[phated]

• I talked about the limitations in the ESM PR and suggestion in the ts-node transpile PR and discussed this with @fvictorio

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Due to the way hardhat registers tasks, v3 can't support ESM (as I outlined at #1994 (comment)); however, you can load .cjs files inside an ESM project. Since many projects are converting to ESM-only, it is helpful to be able to run hardhat in those contexts.

This change should allow a monorepo to become "type": "module" and still use hardhat in commonjs mode. 🎉

This support is in parallel to my other PR (#3017) which adds this support for TypeScript. There are follow up PRs to allow loading of ESM tasks and scripts.

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Name	Status	Preview	Updated
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This issue is also being tracked on Linear.

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LINEAR-ID: be8191f8-10f8-4c1f-af20-4d7d0e39feca

[phated]

With this .cjs change, I found that the run task just supports ESM, so I've added those tests to this PR! 🎉

[alcuadrado]

👑

[alcuadrado]

Should we review and merge this and #3017 in any particular order?

[phated]

@alcuadrado I think we should merge this one first. I believe that the TS change should also add tests for run/test tasks after those are done for JS.

[phated]

@alvrs was testing this out and pointed out that I didn't update isCwdInsideProject 🙈 This fixes the issue and adds a test

@alcuadrado Do you think this can land soon so I can rebase #3156 and update #3017 ?

[fvictorio]

Merging this to the esm feature branch.