[cecil-tests] Enable previously disabled tests. (#14587)

Looks like these might be fixed now.

Fixes https://github.com/xamarin/maccore/issues/2547.

tests/cecil-tests/ConstructorTest.cs

@@ -225,9 +225,6 @@ namespace Cecil.Tests {
 			return method.IsPublic;
 		}
 
-#if NET
-		[Ignore ("To be fixed after the move to an outside bot: https://github.com/xamarin/maccore/issues/2547.")]
-#endif
 		[Test]
 		[TestCase (ApplePlatform.iOS)]
 		[TestCase (ApplePlatform.TVOS)]
@@ -368,9 +365,6 @@ namespace Cecil.Tests {
 			return false;
 		}
 
-#if NET
-		[Ignore ("To be fixed after the move to an outside bot: https://github.com/xamarin/maccore/issues/2547.")]
-#endif
 		[Test]
 		[TestCase (ApplePlatform.iOS)]
 		[TestCase (ApplePlatform.TVOS)]

tests/cecil-tests/ObsoleteTest.cs

@@ -13,10 +13,6 @@ namespace Cecil.Tests {
 
 	[TestFixture]
 	public class ObsoleteTest {
-
-#if NET
-		[Ignore ("To be fixed after the move to an outside bot: https://github.com/xamarin/maccore/issues/2547.")]
-#endif
 		[TestCaseSource (typeof (Helper), nameof (Helper.NetPlatformImplementationAssemblies))] // call this method with every .net6 library
 		public void GetAllObsoletedThings (string assemblyPath)
 		{

tests/cecil-tests/OpenTKTest.cs

@@ -10,10 +10,6 @@ using Mono.Cecil;
 namespace Cecil.Tests {
 	[TestFixture]
 	public class OpenTKTest {
-
-#if NET
-		[Ignore ("To be fixed after the move to an outside bot: https://github.com/xamarin/maccore/issues/2547.")]
-#endif
 		[TestCaseSource (typeof (Helper), nameof (Helper.NetPlatformAssemblies))]
 		// https://github.com/xamarin/xamarin-macios/issues/9724
 		public void BeGone (string assemblyPath)