Devices: Unify Port Gathering method

All devices that support it use the same mechanism to gather ports
so this patch removes the individual implementations in favor
of a single one in IDevice.cpp.

This patch also removes:
* canAutodetectPorts() as it was not used.
* Port::parseFrom...Output as they are not used anymore.

Change-Id: I8ecedec2d71e60985402387982c64311c5a651e6
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/qnx/qnxdevice.cpp

@@ -78,16 +78,6 @@ public:
         }});
     }
 
-    PortsGatheringMethod portsGatheringMethod() const final
-    {
-        return {
-            [this](QAbstractSocket::NetworkLayerProtocol) {
-                return CommandLine(filePath("netstat"), {"-na"});
-            },
-            &Port::parseFromNetstatOutput
-        };
-    }
-
     DeviceProcessSignalOperation::Ptr signalOperation() const final
     {
         return DeviceProcessSignalOperation::Ptr(new QnxDeviceProcessSignalOperation(sharedFromThis()));