Remove unnecessary conformance test

Source/QuestPDF.ConformanceTests/TableWithComplexHeadersTests.cs

@@ -1,18 +0,0 @@
-using QuestPDF.ConformanceTests.TestEngine;
-using QuestPDF.Drawing;
-using QuestPDF.Fluent;
-
-namespace QuestPDF.ConformanceTests;
-
-internal class TableWithComplexHeadersTests : ConformanceTestBase
-{
-    protected override Document GetDocumentUnderTest()
-    {
-        throw new NotImplementedException();
-    }
-
-    protected override SemanticTreeNode? GetExpectedSemanticTree()
-    {
-        throw new NotImplementedException();
-    }
-}