Expand error catching for request to graph

[alyssadai]

(See related neurobagel/federation-api#74 for reference)

The type of request error we're currently trying to catch is too narrow:

api/app/api/crud.py

Lines 52 to 57 in 1f89c22

	except httpx.ConnectTimeout as exc:
	raise HTTPException(
	status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
	detail="Timed out while connecting to the server. You may not be on an authorized network to perform this request.",
	) from exc

any other type of timeout or error from the graph is not caught and results in an Internal server error. We may want to add a catch for a generic Exception and return any error message we get so API users get a more useful error. Basically, we want to minimize the dreaded Internal server error!!!!

We may also want to double check the error catching for requests related to other API endpoints, such as /attributes.