rework Skia setup

Calls to SkiaHelper::isVCLSkiaEnabled() may be done from many places,
even if LO uses a VCL plugin that doesn't use Skia, which leads
to the Skia code not being prepared properly (and crashing/asserting).
So make the SalInstance of those relevant VCL plugins call a setup
function that is required for Skia actually getting enabled.
Avoids crashes/asserts in the About dialog if the Skia UI checkbox
is enabled but e.g. the KF5 VCL plugin is actually used.

Change-Id: Ib56a5f32e88bd130a4c564031313f85e99898ba7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/90376
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

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