Prevent duplicate executions

[Josh-XT]

This pull request includes a significant refactor of the command and answer handling logic in the run method of the agixt/Interactions.py file. The changes aim to improve the structure and readability of the code while ensuring that commands and responses are processed more efficiently.

Key changes include:

Command Handling Improvements:

• Introduced a processed_length variable to track the length of the response that has been processed, ensuring that only new content is processed in each iteration.
• Added an initial command execution check to handle any commands present in the initial response before entering the main processing loop.

Main Processing Loop Enhancements:

• Refactored the main processing loop to check for new commands and process them only if new content is detected, reducing unnecessary iterations.
• Improved the handling of the answer block by ensuring that the loop continues to check for new commands after obtaining more response content.

These changes aim to optimize the command execution flow and ensure that the assistant's response is processed efficiently.