[Storage] Check if inherited methods (from abstrac_storage) respect the retries

[rzvoncek]

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Sometimes at tests we still get random errors at places like gcs_storage._upload_blob(). This mehtod does have a retry on it. It's not clear if the error bubling up actually wenth through the retries or the @Retry annotation is not effective.

During a refactoring week, it'd be great to see how this precisely works.

In the worst case, we need to make sure all the retries are working properly.

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