[flutter_tools] flutter logs no longer requires supported device (#66696)

Flutter logs should not attempt to filter the device list based on the current project, because it does not require a current project. Also fix disabled polling test

Fixes #47996
Fixes #63550
diff --git a/packages/flutter_tools/lib/src/device.dart b/packages/flutter_tools/lib/src/device.dart
index 2e7b219..cdc2c70 100644
--- a/packages/flutter_tools/lib/src/device.dart
+++ b/packages/flutter_tools/lib/src/device.dart
@@ -77,7 +77,7 @@
   String toString() => value;
 }
 
-/// A class to get all available devices.
+/// A disovery mechanism for flutter-supported development devices.
 abstract class DeviceManager {
 
   /// Constructing DeviceManagers is cheap; they only do expensive work if some
@@ -210,6 +210,9 @@
   /// * If the user did not specify a device id and there is more than one
   /// device connected, then filter out unsupported devices and prioritize
   /// ephemeral devices.
+  ///
+  /// * If [flutterProject] is null, then assume the project supports all
+  /// device types.
   Future<List<Device>> findTargetDevices(FlutterProject flutterProject, { Duration timeout }) async {
     if (timeout != null) {
       // Reset the cache with the specified timeout.
@@ -310,8 +313,12 @@
 
   /// Returns whether the device is supported for the project.
   ///
-  /// This exists to allow the check to be overridden for google3 clients.
+  /// This exists to allow the check to be overridden for google3 clients. If
+  /// [flutterProject] is null then return true.
   bool isDeviceSupportedForProject(Device device, FlutterProject flutterProject) {
+    if (flutterProject == null) {
+      return true;
+    }
     return device.isSupportedForProject(flutterProject);
   }
 }
@@ -428,7 +435,7 @@
 
   Future<List<Device>> pollingGetDevices({ Duration timeout });
 
-  Future<void> startPolling() async {
+  void startPolling() {
     if (_timer == null) {
       deviceNotifier ??= ItemListNotifier<Device>();
       // Make initial population the default, fast polling timeout.
@@ -449,18 +456,18 @@
     });
   }
 
-  Future<void> stopPolling() async {
+  void stopPolling() {
     _timer?.cancel();
     _timer = null;
   }
 
   @override
-  Future<List<Device>> get devices async {
+  Future<List<Device>> get devices {
     return _populateDevices();
   }
 
   @override
-  Future<List<Device>> discoverDevices({ Duration timeout }) async {
+  Future<List<Device>> discoverDevices({ Duration timeout }) {
     deviceNotifier = null;
     return _populateDevices(timeout: timeout);
   }
@@ -480,7 +487,7 @@
     return deviceNotifier.onRemoved;
   }
 
-  Future<void> dispose() async => await stopPolling();
+  void dispose() => stopPolling();
 
   @override
   String toString() => '$name device discovery';