qmlls should know about implicit imports of nested QML

this is a follow up of https://bugreports.qt.io/browse/QTBUG-126504

got issues with  ekkeTestNested project, attached to QTBUG-126504

tested withQt 6.8 Beta1 and QtC 14.0.0 Beta1, where QML Language Server is used

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Main.qml import Ekke.Apps.Main:

Main.qml:-1: warning: Failed to import Ekke.Apps.Main. Are your import paths set up properly?

QML_SINGLETON MyApp in Main.qml getting 'unqualified access'

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HomePage

pages/HomePage.qml:34: warning: LabelTitle was not found. Did you add all import paths?

pages/HomePage.qml:34: warning: 'LabelTitle' is used but it is not resolved

same for FloatingActionButton, AdminDialog

explicit import doesnt help

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AdminDialog

with explicit import:

popups/AdminDialog.qml:-1: warning: Failed to import Ekke.Apps.Main. Are your import paths set up properly?

LabelTitle and LabelSubheading now not found

QML_ELEMENT SettingsData not recognized:

popups/AdminDialog.qml:25: warning: SettingsData was not found. Did you add all import paths?

QML_ELEMENT not recognized and QML_SINGLETON DataManager 'unqualified access'

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probably the issues with QML_SINGLETONs 'unqualified access' and QML_ELEMENTs not recognized are gone with https://codereview.qt-project.org/c/qt/qtdeclarative/+/570271

Would be great if import paths - errors will go away and qmlls will know about nested QML dirs and implicit imports.

will test again immediately with 6.8 Beta2