Activate hanging test file (#7298)

Author: forki

tests/fsharp/FSharpSuite.Tests.fsproj

@@ -47,6 +47,7 @@
     <Compile Include="Compiler\ErrorMessages\AssignmentErrorTests.fs" />
     <Compile Include="Compiler\ErrorMessages\WarnExpressionTests.fs" />
     <Compile Include="Compiler\ErrorMessages\DontSuggestTests.fs" />
+    <Compile Include="Compiler\Warnings\AssignmentWarningTests.fs" />
     <Compile Include="Compiler\SourceTextTests.fs" />
     <Compile Include="Compiler\Language\AnonRecordTests.fs" />
     <Compile Include="Compiler\Language\SpanOptimizationTests.fs" />