Revert "[Impeller] remove image upload workarounds."

[jonahwilliams]

Reverts #47209

This actually did regress things, I benchmarked poorly!

see https://flutter-flutter-perf.skia.org/e/?queries=device_type%3DPixel_7_Pro%26sub_result%3D90th_percentile_frame_rasterizer_time_millis%26sub_result%3D99th_percentile_frame_rasterizer_time_millis%26sub_result%3Daverage_frame_rasterizer_time_millis%26sub_result%3Dworst_frame_rasterizer_time_millis%26test%3Dnew_gallery_impeller__transition_perf

I did check https://developer.arm.com/documentation/101897/0301/CPU-overheads/Vulkan-CPU-memory-mapping and we're following the expected advice there. Without a much deeper investigation though we may not have any idea what to do

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