Add non-blocking provider preloader

frontend/lib/ui/artefact_page/artefact_page_body.dart

@@ -4,13 +4,14 @@ import 'package:intersperse/intersperse.dart';
 import 'package:yaru/yaru.dart';
 import '../../models/artefact.dart';
 import '../../models/test_execution.dart';
+import '../../providers/environments_issues.dart';
 import '../../providers/filtered_test_executions.dart';
+import '../../providers/tests_issues.dart';
 import '../../routing.dart';
+import '../non_blocking_provider_preloader.dart';
 import '../spacing.dart';
-import 'environment_issues/environment_issues_preloader.dart';
 import 'rerun_filtered_environments_button.dart';
 import 'test_execution_expandable/test_execution_expandable.dart';
-import 'test_issues/test_issues_preloader.dart';
 
 class ArtefactPageBody extends ConsumerWidget {
   const ArtefactPageBody({super.key, required this.artefact});
@@ -44,8 +45,10 @@ class ArtefactPageBody extends ConsumerWidget {
             const RerunFilteredEnvironmentsButton(),
           ],
         ),
-        EnvironmentIssuesPreloader(
-          child: TestIssuesPreloader(
+        NonBlockingProviderPreloader(
+          provider: environmentsIssuesProvider,
+          child: NonBlockingProviderPreloader(
+            provider: testsIssuesProvider,
             child: Expanded(
               child: ListView.builder(
                 itemCount: testExecutions.length,

frontend/lib/ui/non_blocking_provider_preloader.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+class NonBlockingProviderPreloader extends ConsumerWidget {
+  const NonBlockingProviderPreloader({
+    super.key,
+    required this.provider,
+    required this.child,
+  });
+
+  final ProviderListenable provider;
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    ref.watch(provider);
+    return child;
+  }
+}