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test(console): make test_pty_console_full deterministic

On Linux, a kworker moves the output written to a PTY master into the
line discipline asynchronously. After the test filled the PTY until
EAGAIN, the kworker could still free some space, so the next console
write could succeed without discarding the unread output, and the test
timed out waiting for the newest output.

Write all of the output at once instead. The PTY cannot take all of it,
so the last write always finds the buffer full.

Fixes: 0b7e974e8543 ("feat(console): redirect the guest console to a PTY")
Signed-off-by: Changyuan Lyu <changyuanl@google.com>

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