* fix(scripts): include nginx logs in dev_multi_instance.sh logs all
`logs all` selected only the two Gateway logs, the same as running
`logs` with no argument, so nginx's error and access logs never showed
up although the help lists all next to nginx. `all` now adds the nginx
logs, and the nginx selection also covers nginx.log, where the start
command's own output goes and which no option printed before.
* docs(changelog): reference #7723 for the dev_multi_instance logs fix
* test(scripts): pin dev_multi_instance logs when nginx never started
Cover the layout start_nginx leaves behind when it bails on a missing
binary or a busy port: only gateway-*.log exists, so `logs all` prints
the two Gateway files and `logs nginx` prints nothing, both exiting 0.
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