QNetworkInformation: Rename parameter-less load() to loadDefaultBackend

To clarify its purpose and separate it from the others

Pick-to: 6.3
Change-Id: Id9efcf474ac0cd8777393380bb85c83780454005
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/network/kernel/qnetworkinformation.cpp

@@ -662,9 +662,9 @@ QNetworkInformation::Features QNetworkInformation::supportedFeatures() const
     Returns \c true if it managed to load the backend or if it was already
     loaded. Returns \c false otherwise.
 
-    \sa instance
+    \sa instance(), load()
 */
-bool QNetworkInformation::load()
+bool QNetworkInformation::loadDefaultBackend()
 {
     int index = -1;
 #ifdef Q_OS_WIN

src/network/kernel/qnetworkinformation.h

@@ -100,7 +100,7 @@ public:
     bool supports(Features features) const;
     Features supportedFeatures() const;
 
-    static bool load();
+    static bool loadDefaultBackend();
     static bool load(QStringView backend);
     static bool load(Features features);
     static QStringList availableBackends();

tests/manual/qnetconmonitor/tst_qnetconmonitor.cpp

@@ -105,7 +105,7 @@ void testDetectRouteDisrupted()
     QTextStream writer(stdout);
 
     {
-        if (!QNetworkInformation::load()) {
+        if (!QNetworkInformation::loadDefaultBackend()) {
             writer << "Error: Failed to start";
             return;
         }

tests/manual/qnetworkinformation/tst_qnetworkinformation.cpp

@@ -47,7 +47,7 @@ int main(int argc, char **argv)
 #endif
 
     // Use the platform-default:
-    if (!QNetworkInformation::load()) {
+    if (!QNetworkInformation::loadDefaultBackend()) {
         qWarning("Failed to load any backend");
         qDebug() << "Backends available:" << QNetworkInformation::availableBackends().join(", ");
         return -1;