quic: add mfail test for multi-packet RXE#31331
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Add a record layer test that executes qrx_process_pkt() under mfail on a freshly created qrx whose rx_free freelist is empty. This deterministically lands the qrx_ensure_free_rxe() call for the first packet of a multi-packet datagram among the enumerated injection points which is the precondition for triggering assert failure in qrx_validate_hdr_early(). The test reuses rx_script_5's coalesced Initial+Handshake+1-RTT datagram and only provides the Initial secret, since the bug fires before any decryption is attempted.
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Add a record layer test that executes qrx_process_pkt() under mfail on a freshly created qrx whose rx_free freelist is empty. This deterministically lands the qrx_ensure_free_rxe() call for the first packet of a multi-packet datagram among the enumerated injection points which is the precondition for triggering assert failure in qrx_validate_hdr_early(). The test reuses rx_script_5's coalesced Initial+Handshake+1-RTT datagram and only provides the Initial secret, since the bug fires before any decryption is attempted.
This is a test for #31316