fix: return 400 if transaction logs not found

[arcoraven]

PR-Codex overview

This PR enhances error handling in the getTransactionLogs function by introducing a try-catch block for fetching the transaction receipt. It also updates the error message for clarity when a transaction has not been mined.

Detailed summary

• Added import of TransactionReceipt from thirdweb/transaction.
• Changed the declaration of transactionReceipt to include TransactionReceipt | undefined.
• Wrapped the receipt fetching logic in a try-catch block.
• Updated the error message to "Unable to get transaction receipt. The transaction may not have been mined yet."

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