fix(bigquery/storage/managedwriter): remove old header routing #6960
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Previously, we needed to inject a routing header when opening the bidi AppendRows connection to successfully route traffic to the correct region. Routing no longer needs this explicit hint, and works by examining the requests on the stream.
This change removes the header injection, and also simplifies the open contract we use to no longer include a stream ID, which was in place solely for the injection.
Related internal issue: 185842996