Change the external projects approach for multi-abi builds

Instead of generating external projects that build the project tree
for each target, this creates a single project for each ABI that have
the common for all targets configure steps. Each executable target
then adds additional build step to each ABI-specific external project,
that builds and copies dependencies to the "main" project build tree.

To resolve dependencies from the build tree, when building multi-abi
apk instead of scanning the build directories of external projects for
dependencies, it makes sense to run androiddeployqt for each
ABI-specific external project to copy all necessary libraries. This
is done by adding --copy-dependencies-only flag to androiddeployqt
that only copies the apk dependencies, but avoids creating apk and all
the essential steps. The ABI-specific external project now handles the
deploying of the build artifacts to the end-point apk deployment
directory and the "main" project assembles the apk using collected
artifacts. The ABI-specific external project uses the
qt_internal_${target}_copy_apk_dependencies target to run androiddeployqt
with the introduced --copy-dependencies-only flag.

TODO: Build steps that build and copy the ABI-specific apk
dependencies are non-skipable and will run each time top-level build
is triggered. This behavior should be fixed by adding dependencies to
the generated by androiddeployqt DEPFILES for each ABI in the
top-level build.

Task-number: QTBUG-88841
Tash-number: QTBUG-94714
Change-Id: Id442a9fbd589f58b70f4204c5215645056b379a2
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

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