Use `#performed?` to terminate controller callbacks
Since 69009f, `ActionController::Metal::DataStreaming#send_file` doesn't set `@_response_body` anymore. `AbstractController::Callbacks` used `@_response_body` in its callback terminator, so it failed to halt the callback cycle when using `#send_file` from a `before_action`. Instead, it now uses `#performed?` on `AbstractController::Base` and `ActionController::Metal`, which checks `response.committed?`, besides checking if `@_response_body` is set, if possible. Example application: https://gist.github.com/jeffkreeftmeijer/78ae4572f36b198e729724b0cf79ef8e
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