Update checked based on the variant type of the value

In `EditorProperty::update_revert_and_pin_status`, if `checkable` is `true`, update `checked` based on the variant type of the value, and rename the function as `EditorProperty::update_editor_property_status`.

**Known problems:**
1. Unable to check Checkbox for properties of type `Object` when it is unchecked. This is probably because during value store/fetch, the `nullptr` (variant type is `Variant::OBJECT`) eventually becomes `Variant()` (variant type is `Variant::NIL`).
2. For theme overrides, click the revert icon will uncheck the Checkbox. This is probably because `EditorPropertyRevert::get_property_revert_value` returns `Variant()`.

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