Add RegistryBuilder for tests, and update crates-io error handling. #9126
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This adds
RegistryBuilder
to the test suite to make it more flexible to create different registry setups, and to reuse code a little more easily.This also makes a small adjustment to the registry API to add a
ResponseError
type to make it easier to work with API errors. As part of this, some tests were added to validate the API behavior for response errors. There are only a few very small changes here:crates.io
.)Split from #9111.