When using unbounded PCollection from TextIO to BigQuery, data is stuck in Reshuffle/GroupByKey inside of BigQueryIO
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Description
As a short summary, when reading from TextIO with watchForNewFiles (unbounded collection), BigQueryIO in stream mode, BigQueryIO does not write data. It is "stuck" in a GroupByKey internal to Reshuffle.
The issue is detailed in stackoverflow with code and version information.
[https://stackoverflow.com/questions/53266689/when-using-unbounded-pcollection-from-textio-to-bigquery-data-is-stuck-in-reshu](https://stackoverflow.com/questions/53266689/when-using-unbounded-pcollection-from-textio-to-bigquery-data-is-stuck-in-reshu)
Thanks!
Imported from Jira [BEAM-6061](https://issues.apache.org/jira/browse/BEAM-6061). Original Jira may contain additional context.
Reported by: Florian Baumert.
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