Attempt to prevent reprovisioning of existing agents and the reuploading of files

[FireMMDC]

Adding logic to prevent the duplication of existing agents, and to prevent existing files from being reuploaded. The script still needs tool integration for agents.

In order to allow for retrieval file modification either the contents of the files can be compared using https://platform.openai.com/docs/api-reference/files/retrieve-contents , or it could be required that whenever a retrieval file needs to be updated its file name should also be updated.

[daveshap]

Looks good, I'll ask the community to validate and test.