make all Skia drawing GPU-backed, if possible

This primarily means using SkiaHelper::createSkSurface(), which will
create a GPU-backed SkSurface if Vulkan is used, and it is used in place
of temporary SkBitmap instances, which are always raster-based.

Change-Id: I3fe35866f962030f464d5c1d1c4bf518c20ee9af
Reviewed-on: https://gerrit.libreoffice.org/84562
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

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