[4.0] Treat network errors and GraphQL errors the same

[jerelmiller]

Currently the errorPolicy only handles GraphQL errors differently where network errors are treated as fatal. In some cases this means that network errors result in throwing the error.

With the changes to consolidate errors to a single error policy and split up error types, it makes sense that we treat all errors the same, regardless of their origin.

[jerelmiller]

Finished with #12457 (queries), #12475 (mutations) and #12476 (subscriptions)

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