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R: @jrmccluskey added as fallback since no labels match configuration

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This fixes GCS upload errors are swallowed in PrintWriter at DataflouwRunner.run().

To test the fix, the unit tests mock the static method FileSystems.create() in DataflowRunnerTest. For this, Mockito.mockStatic is used instead of PowerMockito.mockStatic so that we don't need PowerMockRunner anymore for some unit tests that mock static methods.

The dependency mockito-core was replaced by mockito-inline for the Mockito.mockStatic change.

I changed DataflowPipelineOptionsTest as well to remove the usage of PowerMockito.mockStatic. I fixed some warnings such as unnecessary type conversion, unthrown exceptions, etc.