fix: quote output of init command and args to prevent multiline log

[mafredri]

Before:

=== Running the init command /usr/bin/echo [abra
cadabra
] as the "coder" user...
abra
cadabra

After:

=== Running init command as user "coder": ["/usr/bin/echo" "abra\ncadabra\n"]
abra
cadabra

Refs coder/coder#14882

[mtojek]

I know you can't go without my approval :)