Adds backlog reporting support for non-fnapi based SDF's.#38346

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acrites:sdf-backlog

Commits on Apr 30, 2026

Adds backlog reporting support for non-fnapi based SDF's.
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Commits on May 1, 2026

Adds call to newTracker invoker for when GetSize is not defined on an SDF.
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Trigger validates runner tests
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Adding side input to GetSize arguments. It is not technically part of the API in DoFn.java, but some tests are using it.
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Commits on May 8, 2026

Replaces magic -1 with a named constant.
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Commits on May 11, 2026

Replaces new inline ArugmentProvider for getSize, with a Delegating ArgumentProvider to reuse most of the arguments passed to the process element invoker.
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