Add tests for PrinterRequestManager , remove singleton implementation in favor of view constructor arguments

Soyuz/SoyuzApp.swift

@@ -13,6 +13,8 @@ struct SoyuzApp: App {
     
     @State var currentIcon = "move.3d"
     
+    @ObservedObject var printerManager = PrinterRequestManager()
+    
     var body: some Scene {
 //        WindowGroup(id: "floating-stats") {
 //            KlipperMonMenuBarExtraView(currentMenuBarIcon: $currentIcon)
@@ -20,13 +22,13 @@ struct SoyuzApp: App {
 //        }
         
         WindowGroup("Configuration", id: "soyuz_cfg", content: {
-            PrinterConfigView()
+            PrinterConfigView(printerManager: printerManager)
                 //.frame(minWidth: 300, maxWidth: 600, minHeight: 60, maxHeight: 100)
         })
         .windowResizability(.contentSize)
         
         MenuBarExtra("Soyuz", systemImage: currentIcon) {
-            SoyuzMenuBarExtraView(currentMenuBarIcon: $currentIcon)
+            SoyuzMenuBarExtraView(printerManager: printerManager, currentMenuBarIcon: $currentIcon)
                 .padding([.top, .leading, .trailing], 8)
                 .padding([.bottom], 6)
         }