Remove duplicate obsolete constructor tests to avoid duplication

Co-authored-by: jozkee <[email protected]>

Author: Copilot

src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.CreateClient.cs

@@ -99,9 +99,6 @@ public static void InvalidImpersonationLevel_Throws_ArgumentOutOfRangeException(
         [InlineData(PipeDirection.Out)]
         public static void NullHandle_Throws_ArgumentNullException(PipeDirection direction)
         {
-#pragma warning disable SYSLIB0063 // Testing the obsolete constructor
-            AssertExtensions.Throws<ArgumentNullException>("safePipeHandle", () => new NamedPipeClientStream(direction, false, true, null));
-#pragma warning restore SYSLIB0063
             AssertExtensions.Throws<ArgumentNullException>("safePipeHandle", () => new NamedPipeClientStream(direction, false, null));
         }
 
@@ -112,9 +109,6 @@ public static void NullHandle_Throws_ArgumentNullException(PipeDirection directi
         public static void InvalidHandle_Throws_ArgumentException(PipeDirection direction)
         {
             using SafePipeHandle pipeHandle = new SafePipeHandle(new IntPtr(-1), true);
-#pragma warning disable SYSLIB0063 // Testing the obsolete constructor
-            AssertExtensions.Throws<ArgumentException>("safePipeHandle", () => new NamedPipeClientStream(direction, false, true, pipeHandle));
-#pragma warning restore SYSLIB0063
             AssertExtensions.Throws<ArgumentException>("safePipeHandle", () => new NamedPipeClientStream(direction, false, pipeHandle));
         }
 
@@ -135,9 +129,6 @@ public static void BadHandleKind_Throws_IOException(PipeDirection direction)
                     IntPtr handle = safeHandle.DangerousGetHandle();
 
                     SafePipeHandle fakePipeHandle = new SafePipeHandle(handle, ownsHandle: false);
-#pragma warning disable SYSLIB0063 // Testing the obsolete constructor
-                    Assert.Throws<IOException>(() => new NamedPipeClientStream(direction, false, true, fakePipeHandle));
-#pragma warning restore SYSLIB0063
                     Assert.Throws<IOException>(() => new NamedPipeClientStream(direction, false, fakePipeHandle));
                 }
                 finally