Use new qml registration system and new qml cmake api

To be able to use the new qml cmake api, which can also now
generate plugin stubs and do the metatype registration,
a project has to use specific project file structure,
otherwise the meta type registration generator will fail
to include properly headers. Shuffle a bit file locations
for test_support and change how qml modules are built.

We still need to keep plugin.cpp for ithe quick module plugin,
because we use image providers and this requires the qml engine
instance to register.

Pick-to: 6.2
Change-Id: I083b58dac4edc586efca9fae821e5ea645cc2092
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

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