MCU: remove non supported new file templates

Qt Quick Files templates 

• ✔️ Qt Quick qml file
• ❌ Flow Item
• ❌ Flow view
• ✔️ QtQuick UI file
• ✔️ QtQuick Views :: ListView
• ❌ QtQuick Views :: GridView
• ✔️ QtQuick UI form
• ❌ QtQuick UI form :: use application import
• ➕ Some root items for Qml files are not supported

Qt Quick Controls templates

• ✔️ Custom button
• ✔️ Custom checkbox
• ✔️ Custom dial
• ✔️ Custom slider
• ✔️ Custom SpinBox
• ✔️ Custom Switch
• ❌ Custom Pane
• ❌ Custom StackedLayout
• ❌ Custom SwipeView

Qml Files templates

• ✔️ ListModel

Javascript templates

• ❌ Not supported