fix: restore bound operations on containment navigation paths

[tim-sh]

This fixes a bug where actions on navigation properties are missing (regression since 1.2.0).

[daogrady]

not part of the PR, but I believe we were asked to use structuredClone for this scenario.

[daogrady]

Do we have an open issue this PR is addressing?

[daogrady]

I tried a minimal reproduction sample by creating a new project

$ cds init foo --add nodejs,sample
$ cd foo

and editing the srv/AdminService.cds like so:

using {sap.capire.bookshop as my} from '../db/schema';

service AdminService {
  entity Authors as projection on my.Authors;
  entity Books   as projection on my.Books;
  entity Genres  as projection on my.Genres;
  entity Foo {
    key id:UUID;
  } actions {
    action myAction(self: Foo) returns String;
  }
}

I ran

cds compile -2 openapi "*" -s AdminService

from the project root and when encountering the relevant portion of the CSN, I saw the following element:

implying that actions were already not triggering the original first half of the condition to return. So on first glance, it looks like this change had no effect on bound actions.

[daogrady]

Tried the minimal reproduction sample from the original issue. The provided bound action is indeed absent from the output when using openapi:main, but appears in the output with this change. I think we can thus consider this a valid fix. Thanks!