Add regular library in interface_library group of cc_shared_library

The regular library was already accessible via the main_shared_library_output group but making it also available in interface_library when there is no actual interface library available is inline with the current behavior of cc_binary.

RELNOTES:none
PiperOrigin-RevId: 455497044
Change-Id: Ia80fed253e0c79584f23f08eb25b930362e3ff02

src/main/starlark/builtins_bzl/common/cc/experimental_cc_shared_library.bzl

@@ -527,6 +527,8 @@ def _cc_shared_library_impl(ctx):
         interface_library.append(linking_outputs.library_to_link.resolved_symlink_interface_library)
     elif linking_outputs.library_to_link.interface_library != None:
         interface_library.append(linking_outputs.library_to_link.interface_library)
+    else:
+        interface_library = library
 
     return [
         DefaultInfo(