Remove XDP_TEST hook and program type in ebpf-for-windows

[shpalani]

Describe the feature you'd like supported

Currently, ebpf-for-windows has netebpfext extension that supports XDP.
This enhancement request is to move the existing netebpfext's XDP support in ebpf-for-windows, so it can be integrated with xdp-for-windows with the native xdp extension supported.

Work completed

a. Add a new program and attach type: BPF_PROG_TYPE_XDP_TEST and BPF_XDP_TEST in eBPF headers and create new GUIDs for EBPF_PROGRAM_TYPE_XDP_TEST and EBPF_ATTACH_TYPE_XDP_TEST respectively.
b. Implement necessary changes in netebpfext to use the TEST versions in its program information.
c. Modify the program information export tool to export _TEST variants of XDP.
d. Adjust the xdp_tests to override the program type and attach type.

Remaining Work

a. Remove the XDP_TEST hook / program type in netebpfext
b. Move any test coverage of XDP_TEST into xdp-for-windows repo as necessary
c. Remove any ebpf / netebpfext tests that rely on XDP_TEST to use some other program type (this may be a no-op as this should have been completed above, but it is good to double check prior to completion of this task)

Additional context

No response