Consider if we can use hard links for qml files to facilitate proper qmllint warning messages

Context https://git.qt.io/alcroito/qt6-cmake-api-review/-/commit/ed215251491dd566c8791e4c4946c0d41d91d03c#f3ff9c1b48af14adf093e2af0c5cf2849829bb6d_255_257

If qmllint is executed on qml files from the build dir, that will show warning messages pointing to the file paths in the build dir, which if a user edits, might be overwritten later because it's not the original source file.

Consider if we can hard link qml files instead of copying them into the build dir. Thus if a user in an IDE clicks the warning, they'd still fix the correct file.