Nested internal structs in C99 typedefs show up incorrectly (as a separate struct) in Apiview

This might be related to: https://github.com/Azure/azure-sdk-tools/issues/950

For example, see https://apiview.dev/Assemblies/Review/2339253c7f1343dabf7d78ee5b4496aa

Here's the header file with the typedef:
https://github.com/Azure/azure-sdk-for-c/blob/c12a0107925b004be6f130f986999b33acd1c9fa/sdk/inc/azure/core/az_context.h#L31-L45

Here's what we end up seeing:

cc @pakrym, @RickWinter

Compare the C99 typedef in sdk/inc/azure/core/az_context.h at the linked commit with its rendering in the linked APIView review. Trace how the nested internal structs are represented and verify the fix by confirming they no longer appear as separate structs in APIView.

Written by the indexing model from the issue text.