feat: add testFiles option to test solidity

[galargh]

Resolved #6176

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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This introduces an option to run only a subset of solidity tests. The CLI interface I implemented is exactly the same as with the test node task.

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 23, 2025 9:04pm

[ChristopherDedominici]

LGTM. Just a question: is it worth to add a simple test just to cover this new addition?

[galargh]

LGTM. Just a question: is it worth to add a simple test just to cover this new addition?

We're yet to set up solidity test plugin tests. For now, I created the issue for that - #6192 - and I assigned it to myself. I'll jump right on it after we clear the tasks we planned for this sprint.