midi2: prevent UMP packet split across USB transfers

The edpt_stream auto-flush is byte-oriented and could cut an UMP message
in half when the FIFO reached wMaxPacketSize, corrupting the peer's RX
context. Pre-flush whole packets before writing one that would cross the
boundary on both device (tud_midi2_n_ump_write) and host
(tuh_midi2_ump_write) paths. Host write also becomes packet-aware
instead of word-by-word.

Ref #3571

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