`COMMITTED` write stream don't seem to work.

[gpoulin]

I tried to the BigQuery Write Storage API with COMMITTED stream. While there's no errors when writing data in the stream, the data doesn't seem to be inserted; doing a SELECT * FROM table returns 0 result. Using the same code, but with PENDING write stream and adding a call to BatchCommitWriteStreams works just fine.

Looking at the tests, it seems like the WriteStream API is only tested using PENDING stream.

[totem3]

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