dc10c97c

Record only captions in the upload tests' mock media publisher

The mock accumulated full media.PublishParams slices, but tests only
read call counts and captions. Store per-method caption slices instead,
and rename testMediaPublisher to mockMediaPublisher to match the
package's other test doubles.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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