…otnet#107945)

When a nested exported type is marked via link.xml and the declaring type is not marked, cecil will write out an invalid exported type table which will lead to exceptions such as
```
System.ArgumentOutOfRangeException : Specified argument was out of the range of valid values.
   at Mono.Collections.Generic.Collection`1.get_Item(Int32 index)
   at Mono.Cecil.MetadataReader.ReadExportedTypes()
   at Mono.Cecil.ModuleDefinition.<>c.<get_ExportedTypes>b__116_0(ModuleDefinition _, MetadataReader reader)
   at Mono.Cecil.ModuleDefinition.Read[TItem,TRet](TRet& variable, TItem item, Func`3 read)
   at Mono.Cecil.ModuleDefinition.get_ExportedTypes()
   at Mono.Cecil.MetadataResolver.GetType(ModuleDefinition module, TypeReference reference)
   at Mono.Cecil.MetadataResolver.Resolve(TypeReference type)
   at Mono.Linker.Tests.TestCasesRunner.TestResolver.TryResolve(TypeReference typeReference) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\test\Trimming.Tests.Shared\TestResolver.cs:line 12
   at Mono.Linker.ModuleDefinitionExtensions.ResolveType(ModuleDefinition module, String typeFullName, ITryResolveMetadata resolver) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\src\linker\Linker\ModuleDefinitionExtensions.cs:line 50
   at Mono.Linker.TypeNameResolver.<ResolveTypeName>g__GetSimpleTypeFromModule|6_0(TypeName typeName, ModuleDefinition module) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\src\linker\Linker\TypeNameResolver.cs:line 135
   at Mono.Linker.TypeNameResolver.ResolveTypeName(AssemblyDefinition originalAssembly, TypeName typeName, List`1 typeResolutionRecords) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\src\linker\Linker\TypeNameResolver.cs:line 101
   at Mono.Linker.TypeNameResolver.TryResolveTypeName(AssemblyDefinition assembly, String typeNameString, TypeReference& typeReference, List`1& typeResolutionRecords) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\src\linker\Linker\TypeNameResolver.cs:line 44
   at Mono.Linker.Tests.TestCasesRunner.ResultChecker.VerifyLinkingOfOtherAssemblies(AssemblyDefinition original) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\test\Mono.Linker.Tests\TestCasesRunner\ResultChecker.cs:line 320
   at Mono.Linker.Tests.TestCasesRunner.ResultChecker.Check(TrimmedTestCaseResult linkResult) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\test\Mono.Linker.Tests\TestCasesRunner\ResultChecker.cs:line 114
   at Mono.Linker.Tests.TestCases.All.Run(TestCase testCase) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\test\Mono.Linker.Tests\TestCases\TestSuites.cs:line 305
   at Mono.Linker.Tests.TestCases.All.TypeForwardingTests(TestCase testCase) in E:\UnitySrc\dev\unity-runtime-1\src\tools\illink\test\Mono.Linker.Tests\TestCases\TestSuites.cs:line 262
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
```

Or if you were to try and open the linked `Forwarder.dll` without the fix in something like ILSpy, it would crash ILSpy.

An easy way to fix this seems to be marking the declaring type.

* main: (23 commits)
  add important remarks to NrbfDecoder (dotnet#111286)
  docs: fix spelling grammar and missing words in clr-code-guide.md (dotnet#112222)
  Consider type declaration order in MethodImpls (dotnet#111998)
  Add a feature flag to not use GVM in Linq Select (dotnet#109978)
  [cDAC] Implement ISOSDacInterface::GetMethodDescPtrFromIp (dotnet#110755)
  Restructure JSImport/JSExport generators to share more code and utilize more Microsoft.Interop.SourceGeneration shared code (dotnet#107769)
  Add more detailed explanations to control-flow RegexOpcode values (dotnet#112170)
  Add repo-specific condition to labeling workflows (dotnet#112169)
  Fix bad assembly when a nested exported type is marked via link.xml (dotnet#107945)
  Make `CalculateAssemblyAction` virtual. (dotnet#112154)
  JIT: Enable reusing profile-aware DFS trees between phases (dotnet#112198)
  Add support for LDAPTLS_CACERTDIR \ TrustedCertificateDirectory (dotnet#111877)
  JIT: Support custom `ClassLayout` instances with GC pointers in them (dotnet#112064)
  Factor positive lookaheads better into find optimizations (dotnet#112107)
  Add ImmutableCollectionsMarshal.AsMemory (dotnet#112177)
  [mono] ILStrip write directly to the output filestream (dotnet#112142)
  Allow the NativeAOT runtime pack to be specified as the ILC runtime package (dotnet#111876)
  JIT: some reworking for conditional escape analysis (dotnet#112194)
  Replace HELPER_METHOD_FRAME with DynamicHelperFrame in patchpoints (dotnet#112025)
  [Android] Decouple runtime initialization and entry point execution for Android sample (dotnet#111742)
  ...