Allow creating nested SBOM attribution targets also for non-Qt targets
in user projects. This will allow using qt_attribution.json files in
user projects.
Rename PARENT_TARGET to ATTRIBUTION_PARENT_TARGET to make it clear
what the parent target is for.
Task-number: QTBUG-122899
Change-Id: Ia08ee934a9dc03827fcc26d0fc90e072499e8a21
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
(cherry picked from commit a2ddd4fbd88353b21617e539266196b592683a3a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit c276fa45dc38e07a2d42cf2ff2656f820a204078)
e7b3f576ce