Fix NFTMetadata.QuantityOwned for ERC1155

[0xFirekeeper]

Fixes TOOL-3341

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PR-Codex overview

This PR focuses on improving error handling and code clarity in the ThirdwebExtensions.cs file and commenting out test cases in Thirdweb.AI.Tests.cs.

Detailed summary

• Enhanced error handling by adding checks for ownerAddresses and tokenIds length in ThirdwebExtensions.cs.
• Updated variable names for clarity, changing ownerNftTasks to ownedNftTasks and adding ownedBalances.
• Commented out multiple test methods in Thirdweb.AI.Tests.cs to disable them.

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[linear]

TOOL-3341 Wrong quantity owned for erc1155