Add pnpm to tabgroup at hardhat-and-foundry.md

[ismaventuras]

• 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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I was just reading the docs and I saw that at getting started there's a pnpm command to install hardhat but there's no pnpm command in the tab group at the integration with foundry page

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 22, 2024 2:57pm

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