Qml: fix Boot2Qt deployment from Windows host

- fix QmlBuildSystem::target*() to resolve maybe device files
 - Cache lookup of qml path on device

Task-number: QDS-9994
Change-Id: I5675368368f2d1cc513feb98fdcdd75fda1a764a
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp

@@ -91,11 +91,9 @@ QmlProjectRunConfiguration::QmlProjectRunConfiguration(Target *target, Id id)
 
         // arguments from .qmlproject file
         const QmlBuildSystem *bs = qobject_cast<QmlBuildSystem *>(target->buildSystem());
-        const QStringList importPaths = QmlBuildSystem::makeAbsolute(bs->targetDirectory(),
-                                                                     bs->customImportPaths());
-        for (const QString &importPath : importPaths) {
+        for (const QString &importPath : bs->customImportPaths()) {
             cmd.addArg("-I");
-            cmd.addArg(importPath);
+            cmd.addArg(bs->targetDirectory().pathAppended(importPath).path());
         }
 
         for (const QString &fileSelector : bs->customFileSelectors()) {
@@ -114,8 +112,9 @@ QmlProjectRunConfiguration::QmlProjectRunConfiguration(Target *target, Id id)
         }
 
         const FilePath main = bs->targetFile(mainScript());
+
         if (!main.isEmpty())
-            cmd.addArg(main.nativePath());
+            cmd.addArg(main.path());
 
         return cmd;
     });