[subhamkumarr]

Summary

• The Snaps transaction insights tutorial told readers to fund MetaMask Flask from Infura's Sepolia faucet. That faucet product is deprecated, and the old faucet paths on this site redirect to the Infura dashboard.
• Replace that link with a generic public Sepolia faucet note, matching the other tutorials. No specific faucet URL is added.

Fixes #3071

Preview

/snaps/learn/tutorials/transaction-insights/

Test plan

• Open the transaction insights tutorial prerequisites and confirm the tip no longer links to https://www.infura.io/faucet.
• Confirm the tip says to use a public Sepolia faucet, with no faucet URL.
• Confirm the rest of the tutorial is unchanged.

Checklist

• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

External contributor checklist

• I've read the contribution guidelines.
• I've created a new issue (or assigned myself to an existing issue) describing what this PR addresses.

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