Disable failing outerloop tests and fix a build issue in MonoAOTCompiler (#89922)

See #89921 for the test failures.

Additionally, the Android build was failing while compiling an AOT test due to this error:

```
/__w/1/s/artifacts/bin/Android.Device_Emulator.Aot.Test/Release/net8.0/android-x64/AppBundle/modules.c:51:6: error: no previous prototype for function 'register_aot_modules' [-Werror,-Wmissing-prototypes]
void register_aot_modules ()
     ^
```

This is because we turned on `-Werror=missing-prototypes` in #89197 but the MonoAOTCompiler didn't emit a function prototype in modules.c

Fixes #89566

Author: akoeplinger

src/libraries/System.Threading.Tasks/tests/Task/TaskRunSyncTests.cs

@@ -524,6 +524,7 @@ public static void TaskRunSyncTest14()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/89921", typeof(PlatformDetection), nameof(PlatformDetection.IsAlpine), nameof(PlatformDetection.IsMonoRuntime))]
         [OuterLoop]
         public static void TaskRunSyncTest15()
         {
@@ -541,6 +542,7 @@ public static void TaskRunSyncTest16()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/89921", typeof(PlatformDetection), nameof(PlatformDetection.IsAlpine), nameof(PlatformDetection.IsMonoRuntime))]
         [OuterLoop]
         public static void TaskRunSyncTest17()
         {
@@ -550,6 +552,7 @@ public static void TaskRunSyncTest17()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/89921", typeof(PlatformDetection), nameof(PlatformDetection.IsAlpine), nameof(PlatformDetection.IsMonoRuntime))]
         [OuterLoop]
         public static void TaskRunSyncTest18()
         {
@@ -558,6 +561,7 @@ public static void TaskRunSyncTest18()
             test.RealRun();
         }
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/89921", typeof(PlatformDetection), nameof(PlatformDetection.IsAlpine), nameof(PlatformDetection.IsMonoRuntime))]
         [OuterLoop]
         public static void TaskRunSyncTest19()
         {
@@ -567,6 +571,7 @@ public static void TaskRunSyncTest19()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/89921", typeof(PlatformDetection), nameof(PlatformDetection.IsAlpine), nameof(PlatformDetection.IsMonoRuntime))]
         [OuterLoop]
         public static void TaskRunSyncTest20()
         {
@@ -591,6 +596,7 @@ public static void TaskRunSyncTest22()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/89921", typeof(PlatformDetection), nameof(PlatformDetection.IsAlpine), nameof(PlatformDetection.IsMonoRuntime))]
         [OuterLoop]
         public static void TaskRunSyncTest23()
         {

src/libraries/System.Threading.Tasks/tests/TaskScheduler/TaskSchedulerTests.cs

@@ -211,6 +211,7 @@ public static void RunBuggySchedulerTests()
 
         [Fact]
         [OuterLoop]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/89921", typeof(PlatformDetection), nameof(PlatformDetection.IsAlpine), nameof(PlatformDetection.IsMonoRuntime))]
         public static void RunSynchronizationContextTaskSchedulerTests()
         {
             // Remember the current SynchronizationContext, so that we can restore it

src/tasks/AndroidAppBuilder/Templates/monodroid.c

@@ -367,7 +367,7 @@ Java_net_dot_MonoRunner_initRuntime (JNIEnv* env, jobject thiz, jstring j_files_
     for (int i = 0; i < args_len; ++i)
     {
         jstring j_arg = (*env)->GetObjectArrayElement(env, j_args, i);
-        managed_argv[i + 1] = (*env)->GetStringUTFChars(env, j_arg, NULL);
+        managed_argv[i + 1] = (char*)((*env)->GetStringUTFChars(env, j_arg, NULL));
     }
 
     int res = mono_droid_runtime_init (executable, managed_argc, managed_argv, current_local_time);

src/tasks/AotCompilerTask/MonoAOTCompiler.cs

@@ -1106,7 +1106,8 @@ private bool GenerateAotModulesTable(IEnumerable<ITaskItem> assemblies, string[]
                 {
                     writer.WriteLine($"extern void *{symbol};");
                 }
-                writer.WriteLine("void register_aot_modules ()");
+                writer.WriteLine("void register_aot_modules (void);");
+                writer.WriteLine("void register_aot_modules (void)");
                 writer.WriteLine("{");
                 foreach (var symbol in symbols)
                 {
@@ -1142,6 +1143,7 @@ private bool GenerateAotModulesTable(IEnumerable<ITaskItem> assemblies, string[]
                     writer.WriteLine($"extern void *{symbol};");
                 }
 
+                writer.WriteLine("void register_aot_modules (void);");
                 writer.WriteLine("void register_aot_modules (void)");
                 writer.WriteLine("{");
                 foreach (var symbol in symbols)