test(iroh): reevaluate removed tests

[dignifiedquire]

These tests have been removed in #2937 due to complications in the setup, we should investigate if they still provide value, and if so, bring them back

• magicsock::test_two_devices_roundtrip_quinn_raw
• magicsock::test_two_devices_roundtrip_quinn_rebinding_conn
• magicsock::udp_conn::test_rebinding_conn_send_recv_ipv4
• magicsock::udp_conn::test_rebinding_conn_send_recv_ipv6

[dignifiedquire]

I don't think we have any reason to suspect we need these at this point