[iOS] Enable skipped System.Threading tests (#73498)

* [iOS] Enable skipped System.Threading tests

Fixes https://github.com/dotnet/runtime/issues/51400

* Redisable 60583 and remove added newline
Co-authored-by: NSteve Pfister <steve.pfister@microsoft.com>
Co-authored-by: Nmdh1418 <mitchhwang1418@gmail.com>

src/libraries/System.Threading/tests/AutoResetEventTests.cs

@@ -205,7 +205,6 @@ public void WaitHandleWaitAny()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public void PingPong()
         {
             using (AutoResetEvent are1 = new AutoResetEvent(true), are2 = new AutoResetEvent(false))

src/libraries/System.Threading/tests/ExecutionContextTests.cs

@@ -62,7 +62,6 @@ public static void DisposeTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void FlowTest()
         {
             ThreadTestHelpers.RunTestInBackgroundThread(() =>
@@ -170,7 +169,6 @@ public static void FlowTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void CaptureThenSuppressThenRunFlowTest()
         {
             ThreadTestHelpers.RunTestInBackgroundThread(() =>

src/libraries/System.Threading/tests/ManualResetEventTests.cs

@@ -148,7 +148,6 @@ public void WaitHandleWaitAny()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public void PingPong()
         {
             using (ManualResetEvent mre1 = new ManualResetEvent(true), mre2 = new ManualResetEvent(false))

src/libraries/System.Threading/tests/ReaderWriterLockTests.cs

@@ -122,7 +122,6 @@ public static void InvalidLockCookieTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void BasicLockTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -511,7 +510,6 @@ public static void WaitingReadersTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void WaitingWritersTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -543,7 +541,6 @@ public static void WaitingWritersTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void ReadersWaitingOnWaitingWriterTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -594,7 +591,6 @@ public static void ReadersWaitingOnWaitingWriterTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void ReadersWaitingOnWaitingUpgraderTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -648,7 +644,6 @@ public static void ReadersWaitingOnWaitingUpgraderTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void WaitingUpgradersTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -694,7 +689,6 @@ public static void WaitingUpgradersTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void AtomicRecursiveReaderTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -721,7 +715,6 @@ public static void AtomicRecursiveReaderTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public static void AtomicDowngradeTest()
         {
             var trwl = new TestReaderWriterLock();

src/libraries/System.Threading/tests/SemaphoreTests.cs

@@ -279,7 +279,6 @@ public void CanWaitWithoutBlockingForReleasedCount()
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/49890", TestPlatforms.Android)]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51400", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public void AnonymousProducerConsumer()
         {
             using (Semaphore s = new Semaphore(0, int.MaxValue))