Make TextIOTest and AvroIOTest runner-agnostic #17869
Description
PipelineOptions contains a tempLocation property, and IOChannelUtils should be capable of handling arbitrary file locations that are used as a tempLocation.
The read and write tests for TextIO and AvroIO can use these properties to be written in a runner-agnostic fashion, and then be marked as RunnableOnService. Doing so allows all runners integrated with RunnableOnService to benefit from the existing tests.
Imported from Jira BEAM-181. Original Jira may contain additional context.
Reported by: tgroh.