[eventpipe] Use MonoImage:module_name when filename is NULL (#73018)

[eventpipe] Use MonoImage:module_name when filename is NULL (#73018)

* [eventpipe] Use MonoImage:module_name when available, if MonoImage:filename is null

   When assemblies are bundled (for example in WASM), the filename field
   is set to NULL. The module name comes from the metadata Module table and is something like
   "Foo.dll" even if the assembly is loaded from a bundle or from
   Assembly.Load(byte[]), whereas image->name might be "data-0x00abcdef" for byte loads