Adjust lint rules for experimental/web_dashboard (#820)

experimental/web_dashboard/analysis_options.yaml

@@ -7,13 +7,11 @@ analyzer:
 
 linter:
   rules:
-    avoid_print: false
     avoid_types_on_closure_parameters: true
     avoid_void_async: true
     cancel_subscriptions: true
     close_sinks: true
     directives_ordering: true
-    file_names: false
     package_api_docs: true
     package_prefixed_library_names: true
     test_types_in_equals: true

experimental/web_dashboard/lib/src/auth/firebase.dart

@@ -19,8 +19,7 @@ class FirebaseAuthService implements Auth {
   Future<User> signIn() async {
     try {
       return await _signIn();
-    } on PlatformException catch (e) {
-      print('Unable to sign in: $e');
+    } on PlatformException {
       throw SignInException();
     }
   }

experimental/web_dashboard/lib/src/widgets/edit_entry.dart

@@ -89,11 +89,7 @@ class _EditEntryFormState extends State<EditEntryForm> {
                 return null;
               },
               onChanged: (newValue) {
-                try {
-                  widget.entry.value = int.parse(newValue);
-                } on FormatException {
-                  print('Entry cannot contain "$newValue". Expected a number');
-                }
+                widget.entry.value = int.parse(newValue);
               },
             ),
           ),