[hot_reload] Enable some CustomAttributes tests on Mono; new issue fo…

…r async

The async test was marked with the CustomAttributes tracking issue, but it's
actually unrelated.

Fixes dotnet#52993

src/libraries/System.Runtime.Loader/tests/ApplyUpdateTest.cs

@@ -119,7 +119,6 @@ void FirstCallAfterUpdate()
         }
 
         [ConditionalFact(typeof(ApplyUpdateUtil), nameof (ApplyUpdateUtil.IsSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/52993", TestRuntimes.Mono)]
         void ClassWithCustomAttributes()
         {
             ApplyUpdateUtil.TestCase(static () =>
@@ -191,7 +190,6 @@ public void CustomAttributeUpdates()
             });
         }
 
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/52993", TestRuntimes.Mono)]
         [ConditionalFact(typeof(ApplyUpdateUtil), nameof (ApplyUpdateUtil.IsSupported))]
         public void CustomAttributeDelete()
         {
@@ -231,7 +229,7 @@ public void CustomAttributeDelete()
             });
         }
 
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/52993", TestRuntimes.Mono)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/79043", TestRuntimes.Mono)]
         [ConditionalFact(typeof(ApplyUpdateUtil), nameof (ApplyUpdateUtil.IsSupported))]
         public void AsyncMethodChanges()
         {