fix(backend): Fix error pin output not being propagated into the next nodes

[majdyz]

Background

Some blocks have an error output pin, this pin should be auto-populated upon any exception in the block code.
But currently, this output is not propagated into the next node, because the execution is halted on error.

Changes 🏗️

Add propagation logic to the block exception processing step, to allow connected error pin output to be propagated into the next node.

Testing 🔍

Note

Only for the new autogpt platform, currently in autogpt_platform/

• Create from scratch and execute an agent with at least 3 blocks
• Import an agent from file upload, and confirm it executes correctly
• Upload agent to marketplace
• Import an agent from marketplace and confirm it executes correctly
• Edit an agent from monitor, and confirm it executes correctly

[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Error Handling The new error handling logic propagates errors to the next nodes. Verify if this is the intended behavior and if it could lead to unexpected cascading errors in the system. Resource Management The credentials lock is now released in the finally block. Ensure this doesn't introduce any potential resource leaks or race conditions. Credit Management The credit check and spending have been moved. Verify if this new placement ensures proper credit management in all execution scenarios, including error cases.