service/lexruntimev2: Add fix to prevent HTTP/2 event stream request hang on error with Go 1.15 through 1.17.service/transcribestreamingservice: Add fix to prevent HTTP/2 event stream request hang on error with Go 1.15 through 1.17.- Adds fix addressing an issue where SDK's bi-directional eventstream API operation request could hang when the HTTP/2 stream was closed by the service with a non-200 status code.