[6.1.0]Add support for wrapping system streams in WorkRequestHandler #17593
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There are often places where persistent workers need to swap out the standard system streams to avoid tools poisoning the worker communication streams by writing logs/exceptions to it.
This pull request extracts that pattern into an optional WorkerIO wrapper can be used to swap in and out the standard streams without the added boilerplate.
Closes #14201.
PiperOrigin-RevId: 498983983
Change-Id: Iefb956d38a5887d9e5bbf0821551eb0efa14fce9