[Failing Test]: BigQueryIOWriteTest.testWriteFileSchemaUpdateOptionAllowFieldAddition

### What happened?

Test is flaky. Error message:

```
java.lang.NullPointerException
at org.apache.beam.sdk.io.gcp.bigquery.BigQueryIOWriteTest.schemaUpdateOptionsTest(BigQueryIOWriteTest.java:2945)
at org.apache.beam.sdk.io.gcp.bigquery.BigQueryIOWriteTest.testWriteFileSchemaUpdateOptionAllowFieldRelaxation(BigQueryIOWriteTest.java:2958)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.apache.beam.sdk.testing.TestPipeline$1.evaluate(TestPipeline.java:323)
at org.apache.beam.sdk.io.gcp.bigquery.BigQueryIOWriteTest$1$1.evaluate(BigQueryIOWriteTest.java:229)
at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:54)
```

https://ci-beam.apache.org/job/beam_PreCommit_Java_GCP_IO_Direct_Cron/1360/testReport/junit/org.apache.beam.sdk.io.gcp.bigquery/BigQueryIOWriteTest/testWriteFileSchemaUpdateOptionAllowFieldAddition_2_/

https://ci-beam.apache.org/job/beam_PreCommit_Java_GCP_IO_Direct_Commit/2779/testReport/junit/org.apache.beam.sdk.io.gcp.bigquery/BigQueryIOWriteTest/testWriteFileSchemaUpdateOptionAllowFieldRelaxation_2_/

### Issue Failure

Failure: Test is flaky

### Issue Priority

Priority: 2 (backlog / disabled test but we think the product is healthy)

### Issue Components

- [ ] Component: Python SDK
- [X] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam examples
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