Add error context to the BigQuery FAILED_ROWS tagged output

When using WriteToBigQuery in the Python SDK, a tagged output of FAILED_ROWS is returned with a list of tuples, each tuple having two elements: a string with the table destination and a dict with the row key value pairs.

This tuple does not, however, contain any error context for why the error failed. I propose adding a third value to the tuple which contains an instance of InsertErrorsValueListEntry to easily provide context for the error in question.

Below is a patch to implement this change (from [https://github.com/apache/beam/blob/e39294dfcab25e2fab250a4691c8ee3ac390976d/sdks/python/apache_beam/io/gcp/bigquery.py#L1186)](https://github.com/apache/beam/blob/e39294dfcab25e2fab250a4691c8ee3ac390976d/sdks/python/apache_beam/io/gcp/bigquery.py#L1186)) - I've made a patch locally and can create a PR if it helps (just need access)

 
```

while True:
passed, errors = self.bigquery_wrapper.insert_rows(
project_id=table_reference.projectId,

dataset_id=table_reference.datasetId,
table_id=table_reference.tableId,
rows=rows,

insert_ids=insert_ids,
skip_invalid_rows=True)

failed_rows = [(rows[entry.index], entry)
for entry in errors]
should_retry = any(
bigquery_tools.RetryStrategy.should_retry(

self._retry_strategy, entry.errors[0].reason) for entry in errors)
if not passed:
message
= (
'There were errors inserting to BigQuery. Will{} retry. '
'Errors were {}'.format((""
if should_retry else " not"), errors))
if should_retry:
_LOGGER.warning(message)
else:

_LOGGER.error(message)

rows = [rows[entry.index] for entry in errors]

if not should_retry:

break
else:
retry_backoff = next(self._backoff_calculator)
_LOGGER.info(
'Sleeping
%s seconds before retrying insertion.', retry_backoff)
time.sleep(retry_backoff)

self._total_buffered_rows
-= len(self._rows_buffer[destination])
del self._rows_buffer[destination]

return [
pvalue.TaggedOutput(

BigQueryWriteFn.FAILED_ROWS,
GlobalWindows.windowed_value((destination, row[0], row[1])))

for row in failed_rows
]

```

Imported from Jira [BEAM-10585](https://issues.apache.org/jira/browse/BEAM-10585). Original Jira may contain additional context.
Reported by: nfbuckley.

Inizia in sdks/python/apache_beam/io/gcp/bigquery.py, nel percorso di inserimento WriteToBigQuery indicato; esamina come viene assemblato FAILED_ROWS e come viene rappresentato InsertErrorsValueListEntry. Il lavoro è completato quando ogni output non riuscito include la destinazione, i dati della riga e il contesto dell’errore di inserimento.

Scritto dal modello di indicizzazione a partire dal testo della issue.