Validate user's OpenAI tokens.

[kordless]

We need to validate the user's tokens for talking to OpenAI.

If the user token is bad, we need to take action to disable the endpoint.

Let's assume the user enters a bad token, which will approximate the issue with a valid token expiring later.

If the token is expired, we'll get a dead letter. While this is a good start, the issue is we want to disable the ingest, to prevent additional tasks being spawned.

The disabled endpoint for the pipeline(table for now) should respond with an error that the token is expired.