Tests: Add standalone test configuration preamble


Add the boilerplate standalone test prelude to each test, so that
they can be configured with cmake or qt-cmake directly without the
qt-cmake-standalone-test script.

Task-number: QTBUG-93020
Change-Id: Ib0a8027e01810291ac3b508a1078f3998ee06337
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
commit2f5ab6dde6e62fbacf3838344c371dc0dbb456cb
parente0b47732fea81cb2adbcd188adf036f904718d50
authorJoerg Bornemann <joerg.bornemann@qt.io>
committerJoerg Bornemann <joerg.bornemann@qt.io>
commit timeSat, 29 Aug 2026 05:51:22 +0000