fix(graphql): emit notifications on server error response

[andrewazores]

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Related to #65
Related to #410
Related to cryostatio/cryostat#11

Description of the change:

GraphQL queries which do not explicitly suppress notifications will emit a graphical notification box if there are GraphQL errors in the response.

Motivation for the change:

Previously, notifications would only be displayed if the GraphQL response status code was 4xx/5xx. With this change, 2xx responses which contain a GraphQL error response will also display notifications. This provides the user (or developer) more information about what went wrong with the request.

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... sh smoketest.sh...
2. ...

[andrewazores]

Useful when doing work like in cryostatio/cryostat#307 .

[andrewazores]

Example: