task: Make repository errors more user-friendly

[ogenstad]

Component

API Server / GraphQL

Task Description

After the introduction of Prefect we now catch any raised errors and show them in the logs which can lead to task logs that look like this:

It comes from this section of the code:
https://github.com/opsmill/infrahub/blob/infrahub-v1.1.1/backend/infrahub/git/integrator.py#L176-L201

Instead of raising the error we should check if it's an error from a base exception in Infrahub or the SDK and use the .message attribute for the log and only raise an error like this if the error is of a different kind.

Previously these raised errors would have been caught by the git-agent (https://github.com/opsmill/infrahub/blob/infrahub-v1.1.1/backend/infrahub/message_bus/operations/__init__.py#L57-L68).