remainingBuilds and failedBuilds fields of PresubmitGuard class are required

Author: ievdokdm

app_dart/lib/src/model/firestore/presubmit_guard.dart

@@ -136,8 +136,8 @@ final class PresubmitGuard extends AppDocument<PresubmitGuard> {
     required CiStage stage,
     required int creationTime,
     required String author,
-    int? remainingBuilds,
-    int? failedBuilds,
+    required int remainingBuilds,
+    required int failedBuilds,
     Map<String, TaskStatus>? builds,
   }) {
     return PresubmitGuard._(
@@ -146,8 +146,8 @@ final class PresubmitGuard extends AppDocument<PresubmitGuard> {
         fieldCreationTime: creationTime.toValue(),
         fieldAuthor: author.toValue(),
         fieldCheckRun: json.encode(checkRun.toJson()).toValue(),
-        fieldRemainingBuilds: ?remainingBuilds?.toValue(),
-        fieldFailedBuilds: ?failedBuilds?.toValue(),
+        fieldRemainingBuilds: remainingBuilds.toValue(),
+        fieldFailedBuilds: failedBuilds.toValue(),
         if (builds != null)
           fieldBuilds: Value(
             mapValue: MapValue(

app_dart/test/model/firestore/presubmit_guard_test.dart

@@ -116,6 +116,8 @@ void main() {
         stage: CiStage.fusionEngineBuild,
         creationTime: 1000,
         author: 'author',
+        remainingBuilds: 0,
+        failedBuilds: 0,
       );
 
       expect(guard.slug, slug);

app_dart/test/service/scheduler_test.dart

@@ -1185,6 +1185,7 @@ targets:
           author: 'dash',
           builds: {'Linux A': TaskStatus.failed},
           failedBuilds: 1,
+          remainingBuilds: 0,
         );
 
         final check = PresubmitCheck(