Follow up to #2527 and #2514

The tests added in this PR account for ~940 of the added lines, however their scenarios are the same as the other upload scenario tests just using the different proto types. The remaining ~300 lines are the fix and small refactor to get the tests passing. I've left individual commits in the PR to make it easier to drill down if needed.

• Part 1, add tests and simulation server

  • Tests are a port of those added in fix: add strict client side response validation for gRPC chunked resumable uploads #2527 using BidiWriteObjectRequest and BidiWriteObjectResponse
  • simulation server is a port of com.google.cloud.storage.ITGapicUnbufferedWritableByteChannelTest.DirectWriteService using BidiWriteObjectRequest and BidiWriteObjectResponse

• Cleanup unused inner-class

• Move request trimming inline rather than at the end

• Update GapicBidiUnbufferedWritableByteChannel to correctly handle failure scenarios {1, 2, 3, 4, 4_1, 4_2, 5, 7}

  Refactor ResumableSessionFailureScenario to accept Message and List rather than WriteObjectResponse and List.

  The shape of BidiWriteObjectRequest/WriteObjectRequest and BidiWriteObjectResponse/WriteObjectResponse are largely the same (bidi has two extra fields) so rather than overloading toStorageException yet again, this time there is a single method for grpc messages that internally can branch when formatting the request. In this case, we're quite safe taking this relaxed typing because it is an internal API that is only called from a grpc context where protos will be used.

• Update GapicBidiUnbufferedWritableByteChannel to correctly handle partial consumption of content

  Tests passing now.

  Separate tracking of client detected errors and stream errors.

  When await is invoked, if a client detected error is present AND a stream error is present, the client detected error will take precedence. If a stream error happens and the client detected error has not yet been observed, the stream error will be added as a suppressed exception to the client detected error.