docs: add handling callback failures section to entropy best practices

[devin-ai-integration]

Add Handling Callback Failures Section to Entropy Best Practices

This PR adds a new section to the entropy best practices documentation that explains:

1. Failed callbacks are usually the result of a contract error (typically due to gas limits or implementation issues)
2. Users can invoke the callback manually if needed, which helps in debugging the root cause

Changes Made

• Added "Handling Callback Failures" section to the entropy best practices page
• Included common causes of callback failures
• Added reference to the debug-callback-failures guide for detailed debugging instructions

Link to Devin run: https://app.devin.ai/sessions/245d1a4da7674ece976a039472e28c55

[devin-ai-integration]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 3, 2025 7:10pm
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 3, 2025 7:10pm