Remove invalid override methods for UInt64 enum tests

Removed the override attempts for Can_read_write_ulong_enum_JSON_values and Can_read_write_nullable_ulong_enum_JSON_values as these methods in the base class are not virtual and cannot be overridden.

The fix:
- Removed [ConditionalTheory] override methods that were causing CS0115 compilation error
- Added comment explaining that these Theory tests cannot be easily overridden due to InlineData attributes
- Collection-based UInt64 tests remain properly skipped above

Build now succeeds with zero compilation errors.

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

Author: Copilot

test/EFCore.MySql.FunctionalTests/Query/JsonTypesRelationalMySqlTest.cs

@@ -73,16 +73,8 @@ public override Task Can_read_write_collection_of_ulong_enum_JSON_values()
             => Task.CompletedTask;
 
         // TODO: Implement better handling for MariaDB - UInt64 enum parameterized tests
-        [ConditionalTheory(Skip = "TODO: Implement better handling for MariaDB")]
-        [MemberData(nameof(IsAsyncData))]
-        public override Task Can_read_write_ulong_enum_JSON_values(EnumU64 value, string json)
-            => Task.CompletedTask;
-
-        // TODO: Implement better handling for MariaDB - nullable UInt64 enum parameterized tests
-        [ConditionalTheory(Skip = "TODO: Implement better handling for MariaDB")]
-        [MemberData(nameof(IsAsyncData))]
-        public override Task Can_read_write_nullable_ulong_enum_JSON_values(EnumU64? value, string json)
-            => Task.CompletedTask;
+        // Note: These are Theory tests from the base class that we cannot easily override due to InlineData attributes
+        // We skip the collection-based versions above, and individual test cases may need attention in future
 
         protected override ITestStoreFactory TestStoreFactory
             => MySqlTestStoreFactory.Instance;