Add integration testing for BQ Storage API write modes

[damccorm]

We added STORAGE_WRITE_API and STORAGE_API_AT_LEAST_ONCE BQ sink write modes recently [1] but seems like this is not covered by integration testing today.

This could result in significant breakages that creep into Beam releases (for example, #16599).

These write modes should be regularly integration tested using Jenkins for batch/streaming.

[1]

beam/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryIO.java

Line 1761 in 41d585f

STORAGE_WRITE_API,

Imported from Jira BEAM-13747. Original Jira may contain additional context.
Reported by: chamikara.

[RustedBones]

Can this be done? This would have easily caught #33412 and #33422