BigQueryIO.writeTableRows() and withTimePartitioning() fails with CreateDisposition.CREATE_NEVER

Using the withTimeParitioning() clause with CreateDisposition.CREATE_NEVER fails with the error message "Table with field based partitioning must have a schema." even when schema is provided.

See: [https://github.com/pbrumblay/bigqueryioproblems/blob/master/src/main/java/com/fearlesstg/TimePartitioningTest.java#L41](https://github.com/pbrumblay/bigqueryioproblems/blob/master/src/main/java/com/fearlesstg/TimePartitioningTest.java#L41)

There is also a possibly related error with the TimePartitioning object when the setter setType("DAY") is not used.
```

Incompatible table partitioning specification. Expects partitioning specification interval(type:day,field:PARTITION_DATE),
but input partitioning specification is interval(type:day,field:PARTITION_DATE)
```

See: [https://github.com/pbrumblay/bigqueryioproblems/blob/master/src/main/java/com/fearlesstg/TimePartitioningTest.java#L95](https://github.com/pbrumblay/bigqueryioproblems/blob/master/src/main/java/com/fearlesstg/TimePartitioningTest.java#L95)

Imported from Jira [BEAM-4364](https://issues.apache.org/jira/browse/BEAM-4364). Original Jira may contain additional context.
Reported by: pbrumblay.