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### What?
In a similar vein to #11734, #11733, #10327 - this PR returns a 404 in
the response when a file is not found while using the `storage-gcs`
adapter. Currently a 500 is returned.
### Why?
To return the correct error level in the response when a file is not
found when using `storage-gcs`.
### How?
The GCS nodejs library exposes the `ApiError` as a general error - these
changes check that the caught error is an instance of this class and if
the provided code is a `404`.
d8626adc3b