Complete multi-attach support for Accept

### Describe the feature you'd like supported

Only connect and bind have multi-attach support:
https://github.com/microsoft/ebpf-for-windows/blob/2977cce5be13ac5ad05a4e3a25f93c29a3743765/netebpfext/net_ebpf_ext_sock_addr.c#L1477-L1490

this was closed when the new bind hook was implemented with multi-attach support: https://github.com/microsoft/ebpf-for-windows/issues/5180

listen support is tracked here: https://github.com/microsoft/ebpf-for-windows/issues/5339

we also need accept support.

### Proposed solution

Complete multi-attach support for accept, add tests

### Additional context

_No response_

Start with the multi-attach implementation for connect and bind in netebpfext/net_ebpf_ext_sock_addr.c, especially the referenced section, then locate the corresponding accept path and existing tests. Compare the tracked listen work in issue #5339 as needed. Done means accept supports multi-attach and the added tests pass.

Written by the indexing model from the issue text.