[REG 6.8 -> 6.9] qt_add_translations creates QM files in PROJECT_BINARY_DIR instead of CMAKE_CURRENT_BINARY_DIR

Reported on the mailing list: https://lists.qt-project.org/pipermail/development/2025-March/046190.html

qt_add_translations now creates QM files in PROJECT_BINARY_DIR instead of CMAKE_CURRENT_BINARY dir. The latter is documented and correct.

This seems to have been introduced by https://codereview.qt-project.org/c/qt/qttools/+/624085

Work-around: add IMMEDIATE_CALL to the arguments of qt_add_translations, and make sure the call comes after all translatable targets are fully created.