videoaggregator: Prefer video info from the largest input

Arun Raghavan requested to merge arun/gstreamer:videoagg-format-selection into main

Previously, we picked the video info of the last input the zorder-sorted sinkpad list as the output video info. This could lead to some awkward results, such as picking colorimetry/chroma-site values of a SD input and using that by default for an HD output. It makes more sense to use the video info of the largest input, ideally leading to less work in conversion and a consistent output format.

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