Remove _CustomBigQuerySource implementation to rely on ReadAllFromBigQuery
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gcp
improvement
io
P3
python
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- Java
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Description
there are two implementations of ReadFromBQ. One is used for a new feature in ReadAllFromBQ - the other is used for the regular ReadFromBigQuery transform - we need to move ReadFromBQ to rely on ReadAllFromBQ under the covers.
It is not possible at the moment because ReadAllFromBQ only works on portable runners. Once Python runners are all portable, we can move.
Imported from Jira [BEAM-11115](https://issues.apache.org/jira/browse/BEAM-11115). Original Jira may contain additional context.
Reported by: pabloem.
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