Add QT_QML_GENERATE_QMLLS_INI to kits

As https://doc.qt.io/qt-6/cmake-variable-qt-qml-generate-qmlls-ini.html says, `QT_QML_GENERATE_QMLLS_INI` should be set by IDEs. In this situation, QT_QML_GENERATE_QMLLS_INI can be added to kits as `cmakeSettings`

https://vector-of-bool.github.io/docs/vscode-cmake-tools/kits.html#generic-options

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As This variable is used for IDE integration, it should normally not be set in a project itself, but passed to CMake via an IDE or manually by passing

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